User guide

How to use the ZeroCall app

Everything you do in the app, in order: signing up, calls and texts, AI answering settings, and pricing and payment. Button and menu names are shown like this. The app is in Korean, so the Korean label follows in parentheses.

Last updated: October 29, 2026

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1.ZeroCall at a glance

ZeroCall is an internet phone service (070 and other numbers) for stores. AI answers calls for you, and several staff members can make and take calls and texts on one number.

Groups and roles

  • A group is one store (one or more phone numbers). One account can belong to several groups; switch groups with ☰ at the top left of the screen.
  • The group owner (그룹장) has every permission: payments, phone numbers, business information, deleting the group and changing roles.
  • A manager (매니저) uses admin features such as group settings, member management, bulk texts and CSV export.
  • A member (멤버) handles customers by phone, text and chat, and manages contacts.

The bottom tabs are Phone (전화), Messages (문자), Contacts (연락처), AI and Settings (설정).

2.Getting started

Sign up

  1. 1Open the app and tap Don't have an account? Sign up (계정이 없으신가요? 회원가입) on the login screen.
  2. 2The sign-up page opens inside the app. Follow the instructions to sign up.
  3. 3When you finish and tap OK (확인), you return to the login screen.
Download the app →

Log in

  1. 1Enter your phone number (전화번호) (10 to 11 digits) and password (비밀번호), then tap Log in (로그인).
  2. 2For security, the app may ask for a text verification code. Enter the code in the Verification code (인증번호) field and tap Verify and log in (인증하고 로그인). Once verified, that device will not ask again for 30 days.

If you enter the wrong password 5 times within 15 minutes, login is blocked for a while. The button shows the remaining time.

If you forgot your password

  1. 1Tap Forgot your password? (비밀번호를 잊으셨나요?) on the login screen.
  2. 2Enter your name (이름) and phone number (전화번호) and tap Get a verification code (휴대폰 인증번호 받기).
  3. 3Enter the 6-digit code you received by text and tap Next (다음).
  4. 4Enter the new password twice and tap Done (완료). Passwords must be 8 to 20 characters and include letters, numbers and special characters.

App permissions

PermissionUsed forIf you deny it
MicrophoneCallsThe other party cannot hear your voice during calls
Phone and Bluetooth (Android)Connecting calls, using earphonesCall features are limited
NotificationsReceiving calls and texts when the app is closedOn Android, you cannot receive calls while the app is closed
Phone state (Android 12 and later)Automatically holds a ZeroCall call when a regular mobile call comes inOnly this feature is turned off; ZeroCall calls still work
ContactsImporting phone contactsOnly the import feature is unavailable
Photos and cameraAttaching photos to texts, saving imagesYou cannot attach or save photos

On iPhone, calls ring even without the notification permission, and the standard iPhone incoming call screen appears.

App updates

  • If there is a required update, an update notice appears. You must update to keep using the app.
  • For a recommended update, tapping Later (다음에 할게요) stops the prompt for that version for 30 days.

3.Creating a group and inviting members

Create a group

Path: ☰ > Create a new group (새 그룹 만들기)

  1. 1Choose a plan: pick the plan you want. For your first group, the first number free for the first month offer is applied to the first payment automatically. If you have not completed identity verification or registered a payment method, follow the prompts to do that first.
  2. 2AI answering: turn Use AI answering (AI 자동 응대 사용) on or off. It is on by default. The Eco plan does not support AI.
  3. 3Group information: enter a group name (그룹 이름) (2 to 30 characters) and choose a phone number. Tap 🔄 to get a different number suggested. If you cancelled a number in the last 30 days, you can take it back from Number you used before (이전에 쓰시던 번호).
  4. 4Confirm payment: check the details, tick the acknowledgement box and tap Create group (그룹 만들기).
  5. 5Once the group is created, the member invitation screen opens. To invite people later, tap Later (나중에 하기).
See pricing by plan →

Invite members

Path: Settings (설정) > Manage members (멤버 관리) > Add members (멤버 추가하기)

  1. 1Enter the mobile number of the person you want to invite, without hyphens. For several people, add fields with Add more (더 추가하기).
  2. 2Tap Add members (멤버 추가하기). Invited people appear in the list as Invited (초대 중).

Change roles or remove members (group owner)

  • Tap the role badge (▼) on a member row and choose Manager (매니저) or Member (멤버).
  • To remove a member, tap the 👤− button and then Remove (내보내기).

Switch groups

Tap ☰ at the top left and choose a group from My groups (내 그룹). Phone, Messages, Contacts, AI and Settings all show the currently selected group. Each group shows its counts of unread missed calls, texts and items to review.

4.Making and receiving calls

Make a call

Path: Phone (전화) > Dial (다이얼)

  1. 1Enter a number. After two or more digits, matching contacts are suggested; tap a suggestion to fill in that number. Press and hold 0 to enter +.
  2. 2Tap the green call button.
  3. 3On the call screen you can use Mute (음소거), Speaker (스피커) (on iPhone, choose handset, speaker or Bluetooth under Audio (오디오)), Hold (보류), Keypad (키패드) (for pressing phone menu numbers) and End (종료).

If you move to another screen during a call, a green in-call banner appears at the top right. Tap it to return to the call screen.

You can also call from your ZeroCall number using Call (전화 걸기) in call history, contacts and chat rooms. Call with phone app (휴대폰 앱으로 전화) places the call from your personal mobile number, not your ZeroCall number.

Choose the outgoing number (caller ID)

If the group has additional numbers besides the main number, the dial screen shows Outgoing number ⌄ (보내는 번호).

  • The number you choose is shown to the other party, and if they call back, the call comes in on that number.
  • The choice is remembered on this device, per group, and applies to outgoing calls on every screen. It resets when you log out.
  • Choose Default (기본) to use the default number set in the group settings.

Receive a call

  • Android: tap Answer (응답) or Decline (거절) on the full-screen incoming call window or in the notification. Swiping the notification away also declines the call.
  • iPhone: answer on the standard iPhone incoming call screen. ZeroCall calls also appear in the recent calls of the iPhone Phone app.
  • The phones of several group members ring at the same time. When one person answers, the others stop ringing.
  • Call waiting: if another call comes in during a call, choose Hold and answer (보류하고 받기) or End and answer (끊고 받기). Up to 2 calls at once are supported.

When a regular mobile call comes in (Android 12 and later)

If you allow the Phone state (전화 상태) permission, a ZeroCall call is automatically put on hold with hold music when a regular mobile call comes in. It resumes when the regular call ends.

5.Viewing call history

Recent calls

Path: Phone (전화) > Recent (최근기록)

  • Icon colors: green = outgoing, blue = incoming, red = missed, purple = forwarded, gray = declined
  • Badges: AI answered (AI 응대), Operator answered (운영자 응대), AI then operator (AI 응대 -> 운영자 응대), Missed (부재중), Forwarded (착신전환)
  • Up to 2 lines of the AI summary are shown.
  • Search only covers records already loaded. For older records, scroll down to load them, then search.
  • Turn on My calls only (내 통화만) to see only calls you answered or made.

Call details

  • Play the recording: tap ▶ to play. Calls passed from AI to an operator have separate AI recording (AI 응대 녹음) and Operator recording (운영자 응대 녹음). If you see "The recording is being processed", check again shortly.
  • Transcript (대화 내역): the conversation between the AI or operator and the customer, as text.
  • Action log (액션 기록): what the AI handled during the call (such as taking a booking request).
  • ⋮ menu: Download recording (녹음 다운로드), Download transcript (대화 내역 다운로드) (all / my side only / other side only), AI resolution details (AI 해결 결과 상세), Call (전화 걸기), Send text (문자 보내기), Add contact (연락처 추가)

The Eco plan does not include transcripts (speech-to-text) or summaries.

AI resolution results and disputing a result

Calls answered by AI are marked Resolved (해결), Unresolved (미해결) or Checking (확인 중). If the AI marked a call as resolved but it was not actually resolved, request a change as follows.

  1. 1Go to call details > ⋮ > AI resolution details (AI 해결 결과 상세).
  2. 2Tap Request change to failed (실패 전환 신청), enter a reason and tap Submit (제출).

If the call was already charged, the amount is deducted from your next payment or refunded.

6.Texts and web chat

Chat list

  • The Messages (문자) tab shows your conversations with customers. If you have web chats, All (전체), Text (문자) and Web chat (웹 채팅) filters appear.
  • Turn on My conversations only (내 상담만) to see only conversations you replied to yourself.

Send a new text

  1. 1Tap the 💬+ button at the bottom right of the Messages (문자) tab.
  2. 2Enter the phone number (전화번호) using digits only and tap Go to chat (채팅방으로 이동).
  3. 3Type and send your message. It is sent from the group's default phone number.

Photo attachments and long texts (LMS)

  • + > Photo (사진): choose up to 3 photos from your album. Drag to reorder them.
  • + > Camera (카메라): take and send a photo.
  • + > LMS (title) (LMS (제목)): send a long text with a title. The title can be up to 32 Korean characters.

Under Korean text message standards, emoji cannot be sent. They are removed automatically if you type them.

Failed messages

If a message shows Failed (발송 실패), tap ↻ (send again) or ✕ (cancel the message). If you see a notice that your credit balance is too low, top up your credit or tap Unblock (해제하기) on the banner.

Web chat (website widget)

  • Conversations that come in through your website chat widget carry a Web chat (웹 채팅) badge.
  • To end a conversation, tap End chat (채팅 종료) at the top. A closing message is sent to the visitor.
  • If the visitor's last message was more than 20 minutes ago and the visitor's number is a mobile number, the app asks whether to send your reply by text as well. Texts are charged.

7.Contacts

Managing contacts

What you want to doHow
Add a contactContacts (연락처) > ⋮ > Add contact (연락처 추가). Names are 2 to 20 characters; notes up to 500 characters
Save a number you calledEnter the number on the dial pad and tap 👤+, or call details ⋮ > Add contact (연락처 추가)
Import phone contactsContacts (연락처) > ⋮ > Import contacts (연락처 가져오기) > select (you can Select all (전체선택)) > import
Edit or deleteContact details ⋮ > Edit contact (연락처 편집) / Delete contact (연락처 삭제). You can also press and hold in the list
SearchSearch by name, phone number or note
  • If a contact with the same number already exists, the existing contact opens instead of creating a new one.
  • Custom fields are extra fields defined by the group (yes/no, list, date, number and so on). Fields marked * are required.
  • Contact details show the 5 most recent calls and the 5 most recent conversations.

8.Setting up AI answering

Set this up in the AI tab at the bottom.

Getting started

  1. 1Read the AI agent introduction and tap Get started (시작하기).
  2. 2If you see the Initial AI setup (AI 초기 세팅하기) banner, tap Call my number (내 번호로 걸기). The AI setup assistant calls your number, asks about your store and fills in the information for you. When the call ends, tap Refresh (새로고침).
  3. 3Enter your basic store settings (매장 기본 설정).
  4. 4Register your answer manuals (응답 매뉴얼).

Turning AI on or off (answering mode)

Path: AI > AI answering settings (AI 응대 설정) > Answering mode (응대 모드 설정)

ModeWhat happens
AI + operator (AI + 운영자)AI answers first and connects to an operator when needed
AI only (AI만)Only the AI answers. It does not connect to an operator
Operator only (운영자만)Calls go straight to an operator without AI (AI off)
  • Set the Open hours mode (운영 중 응대 모드) and the Closed hours mode (미운영 중 응대 모드) separately. The defaults are AI + operator during open hours and AI only outside them.
  • Changes are saved immediately. Currently applied (현재 적용 중) shows the mode in effect now.

Business hours

  • Under Current status (현재 상태), choose Auto (자동), Open (운영중) or Closed (운영종료). Open and Closed are manual states that ignore the schedule.
  • Business hours schedule (운영시간 스케줄): add days and times with Add (추가) and tap Save schedule (스케줄 저장). It applies only in Auto status, and public holidays are not excluded automatically.
  • Break periods (비운영 구간): set breaks within business hours, such as lunch. If you enter a message, callers during that time hear it first.
  • If a phone menu (ARS) flow is connected to a number, calls to that number follow the ARS flow first.

Greeting and messages

  • AI greeting (AI 첫 인사 문구): up to 600 characters. {지점명} is replaced with the group name. If left empty, the AI gives a short greeting.
  • Message when no one can be connected (담당자 연결 불가 시 안내 문구): what the AI says in AI only mode when it cannot connect the caller to staff.

Other AI settings

SettingDescription
AI off hours (AI 비활성화 시간)The AI does not answer during the set time. If you choose no days, it applies to today only
Allow interruptions (고객 말 끼어들기 허용)When on, the AI stops talking and listens when the customer speaks. When off, the AI finishes speaking before it listens
AI voice (AI 목소리)Bright female / calm female / bright male (default) / calm male
AI response language (AI 응답 언어)Korean (default) / English / Japanese / Chinese / Thai
Automatic language switching (다국어 자동 전환)The AI switches its response language to match the customer's language

AI usage

At the top of the AI tab you can see resolved and total calls, call time and charges for Today (오늘) and This billing period (이번 결제 기간).

If the AI tab appears dimmed with a notice that AI answering is not available on your plan, the group owner needs to switch to a plan that supports AI under Settings (설정) > Plans and payments (요금제, 결제 관리) and turn on Use AI answering (AI 자동 응대 사용). It takes effect immediately.

9.Answer manuals and store information

The AI answers based on your basic store information and the answer manuals that are switched on. The more detailed and accurate your manuals, the more accurate the answers.

Basic store settings

Path: AI > Basic store settings (매장 기본 설정)

Enter your business hours, address, bank account details, Wi-Fi information, parking information, lost-and-found information and general information, then tap Save (저장). Any format is fine. Additional fields may appear depending on your industry.

Add an answer manual

Path: AI > Add or edit answer manuals (응답 매뉴얼 추가/수정) > Add answer manual (응답 매뉴얼 추가)

  1. 1Write the title (제목) (up to 80 characters) the way a customer would ask. Good: "Can I park there?" Not good: "Parking notice".
  2. 2Under Manual type (매뉴얼 종류), choose General (일반) or Note (노트).
  3. 3For the linked function, usually choose Basic consultation (기본 상담). Additional options may appear depending on your industry.
  4. 4Write the content (내용) (up to 1,500 characters) in 2 to 3 sentences that read well over the phone. Avoid symbols (/, :) and abbreviations.
  5. 5Tap Save (저장).

Note manuals (for taking requests)

Use these when the AI needs to collect information from the customer, such as booking requests or inquiries.

  • Add one or more intake fields (접수 필드). For each field, set the field name (e.g. customer name), key (starting with a letter, e.g. customerName), format (text / number / yes-no), a collection hint and whether it is required.
  • Turn on Connect to staff after intake (접수 후 담당자 연결) to transfer the call to staff once the intake is complete.
  • Collected details go to Actions to review (확인 필요 액션).

Turning manuals on or off, editing and deleting

  • Use the switch on the right of the list to choose whether the AI uses that manual. It saves immediately. Turn seasonal or event manuals on only when you need them.
  • Tap an item to open the Manage manual (매뉴얼 관리) screen. Edit and tap Save (저장); to delete, tap 🗑.

Tips for writing manuals

  • Always include: business hours, location and directions, parking, how to book and the cancellation policy, prices and payment methods, and frequently asked questions.
  • Do not include information that changes in real time, such as booking availability or stock. Instead, write that the AI should say "I will connect you to a staff member."
  • Write down that angry customers, refunds, complicated booking changes and requests to speak to a person should be connected to staff.
  • Do not include personal or payment information.

10.Handling actions to review

These are items the AI took or handled during calls that an admin needs to check, such as requests collected by note manuals. The orange number on the AI tab is the count.

Steps

  1. 1Tap the AI > Actions to review (확인 필요 액션) banner or the push notification.
  2. 2Check the customer, collected fields and summary on the card. Use View call (통화기록 보기) to go to the call, or tap the customer's name or number to call, text or add them as a contact.
  3. 3When you are done, tap Mark as reviewed (확인 완료). The card moves to the Reviewed (확인 완료) tab.

11.Group and call settings

These settings are mainly used by group owners and managers.

Main settings

SettingPathDescription
Group name / call recordingSettings (설정) > Group name and call settings (그룹 이름 및 통화 설정)Only the group owner can change these. Changes apply after you tap Save (저장)
Ringback toneSame screen > Ringback tone (통화 연결음)Set the message (up to 500 characters) and playback speed, then preview it with Generate (생성). Tap Apply this voice (이 음성으로 적용) and turn on the toggle
Call forwardingSame screen > Call forwarding (착신전환)Forwards incoming calls to another number. While it is on, members' phones do not ring
Incoming calls per memberSettings (설정) > Incoming call settings per member (멤버별 전화 수신 설정)Members with receiving turned off do not get calls. Members can change their own setting; the group owner can change everyone's
Who answers each numberSame screen > Change who answers (받는 사람 바꾸기)For each number, set who answers (all staff at the branch / a desk / a member) and the order (1st to 5th). The order can only be set when the queue is on
Telecom service usage certificateSettings (설정) > Issue telecom service usage certificate (통신서비스 이용증명원 발급)Downloads as a PDF
Delete group / leaveBottom of Settings (설정)Deleting permanently erases all data. Any early-termination settlement is charged automatically to the registered payment method

12.Add-on features

Under Settings (설정) > Add-on features (부가서비스), turn on the features included in your plan that you need with Add (추가). They turn on immediately and their settings appear in the menu. If you remove one, existing settings keep working but cannot be changed (the missed-call text and the web chat widget stop immediately when removed).

Features

FeaturePathKey points
QueueSettings (설정) > Queue (대기열)When everyone is on a call, callers wait in order. Distribution is Ring everyone at once (전원 동시 호출) or Longest idle first (가장 오래 쉰 사람부터)
Callback request while waitingInside the queue screenWaiting callers press 1 to request a callback
Phone menu (ARS) flowSettings (설정) > ARS call flow (ARS 통화 흐름)Build a flow from steps: menu choices, playing a message, branching by business hours, sending a text, connecting to the AI and connecting a call. Each number is linked to one flow
Hold musicGroup name and call settings (그룹 이름 및 통화 설정) > Hold music (대기 음악)The app accepts WAV files only (up to 10 minutes). Upload MP3 files on the web
Missed-call textSettings (설정) > Missed-call text (부재중 안내 문자)Automatically texts customers whose calls were missed (up to 2,000 characters). Text charges apply. Not sent while call forwarding is on
Other features–Statistics per agent, consultation history, automatic contact registration, website web chat widget, notes and announcements, desks (phones)

13.Managing numbers and number porting

Managing phone numbers

Path: Settings (설정) > Group name and call settings (그룹 이름 및 통화 설정) > Manage phone numbers (전화번호 관리)

  • ⭐ Set as default (group owner): calls and texts go out from the default number.
  • ✏ Alias (group owner, manager): e.g. "Branch 2" or "Bookings only". Calls and texts to that number show the alias instead of the group name.
  • 🗑 Delete (group owner): at least one number must remain. Deleted numbers cannot be restored.
  • Add number (번호 추가) (group owner): the charge for an additional number is applied on the next billing date.
See additional number pricing →

Number porting (moving your landline number to ZeroCall)

Path: Settings (설정) > Number porting request (번호이동 신청) > Request porting (번호이동 신청) (group owner)

  1. 1Choose the applicant business. A business registration certificate must be registered. Sole proprietors also need the representative's date of birth and ID.
  2. 2Enter the request details: previous carrier, the number to port (landline numbers only, 010 mobile numbers are not allowed), installation address, postal code and a signature image (PNG or JPG, 5 MB or less).
  3. 3Check it with Preview application (신청서 미리보기) and tap Submit (신청하기).
  4. 4The status changes in this order: submitted, under review, porting in progress, completed. Check it in the list or details screen.

14.Business information

Registering and linking

What you want to doPath
Register a businessSettings (설정) > Manage business information (사업자 정보 관리) > Add business information (사업자 정보 추가)
Link a business to a groupSettings (설정) > Link business (사업자 연결) (group owner)
Handle link requests to your businessManage business information (사업자 정보 관리) > link request notice
Handle link requests to your groupSettings (설정) > business link request notice
  • When registering, enter the business type (sole proprietor / corporation), the 10-digit business registration number, business name, representative's name and the business registration certificate (png, jpg, pdf or tif, up to 10 MB). Corporations also need the 13-digit corporate registration number.
  • If an employee registers, a certificate of employment is also required; if an agent registers, a power of attorney is required.
  • The status goes from Pending review (검토 대기) to Approved (승인됨) or Rejected (거절됨). Only approved businesses can be linked to a group, and information cannot be edited after approval.
  • To use a business managed by someone else, search by business registration number and request a link. The link is made once that business's admin approves it.

15.Pricing and payment

See the pricing page for plan prices, included allowances and overage charges.

See pricing →

Payments and changing plans

  • Register a payment method: Settings (설정) > My account (내 계정) > Manage payment methods (결제수단 관리)
  • Change plan, add or cancel AI, payment history, unpaid charges: Settings (설정) > Plans and payments (요금제, 결제 관리) (group owner)
  • Upgrades and adding AI take effect immediately and the difference is charged. Downgrades and cancelling AI take effect from the next billing date.

Credit

  • Usage beyond the included allowance is deducted from credit. Credit is topped up automatically in units of KRW 1,000 from your registered payment method.
  • If you are blocked because of insufficient credit, tap Unblock → (해제하기 →) on the banner. If that fails, top up your credit and try again.
  • Remaining credit is not refunded when a group is deleted.

16.Managing your account

Account menu

ItemPathNotes
Change passwordSettings (설정) > Change password (비밀번호 변경)Enter your current password and a new one
Identity verificationSettings (설정) > Identity verification (본인인증)Required to create a group. Uses a verification app such as PASS
External service integrationSettings (설정) > External service integration (외부서비스 연동 설정)Connects to partner services
Log outSettings (설정) > Log out (로그아웃)After you log out, this device no longer receives calls
Delete accountSettings (설정) > Delete account (회원탈퇴)You must write a reason of at least 10 characters. You cannot delete your account while you own a group. Delete or transfer that group first
FeedbackSettings (설정) > Feedback (피드백)Enter the type (bug report / feature suggestion / other), a title and details
Customer supportSettings (설정) > Customer support (고객센터)

17.Troubleshooting

Common problems

SymptomWhat to check
I can't make callsCheck the notice on screen (low credit, inactive group and so on). If there is a low-credit banner, tap Unblock (해제하기). Check under ☰ that the right group is selected and that you are connected to the network
Calls don't come inCheck that your receiving is on in Incoming call settings per member (멤버별 전화 수신 설정), that call forwarding is off, and that you are included in who answers each number. Android needs the notification permission, and you do not receive calls while logged out
The AI doesn't answerCheck that the answering mode is not Operator only (운영자만), that it is not within AI off hours (AI 비활성화 시간), that your plan supports AI, and that no ARS flow is linked to the number
AI answers are inaccurateImprove your basic store settings and manuals. Write titles the way customers ask, and keep content to 2 to 3 sentences. The AI does not use manuals that are switched off
Emoji were removed from my textEmoji cannot be sent under Korean text message standards, so they are removed automatically
I can't hear the recordingIf it is still processing, check again shortly. Missed, declined and 0-second calls have no recording
I can't see the transcriptThe Eco plan does not include transcripts (speech-to-text) or summaries
A menu is missingMenus are hidden depending on your role (group owner / manager / member) and which add-ons are on. Ask your group owner
A setting is gray and can't be changedThe add-on was removed or is not included in your plan (read-only). Existing settings keep working
It says my service is suspendedContact customer support
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