📻 IeumTalk
IeumTalk · Group Walkie-Talkie
Several people talk in real time with nothing but a phone and earphones.
Built for situations where your hands are busy, such as group cycling.
About
Not a phone call and not a messenger — a group walkie-talkie where everyone talks and listens at once.
①What it is for
Speak now, heard now
A phone call is one-to-one, and a voice message always arrives after a delay. IeumTalk works like a walkie-talkie: turn the mic on and everyone in the channel hears you right away.
Made for group cycling
It was built so riders strung out along the road can pass on signals, hazards and route changes immediately — hands on the bars, eyes ahead.
No radio hardware to buy
It runs on the phone and earphones you already own. Because it goes over the internet there is no range limit like a two-way radio.
②How you use it
- What you need — A phone (Android or iPhone), earphones or a Bluetooth headset, and an internet connection (LTE, 5G or Wi-Fi). There is no sign-up and no login — pick a nickname and you are in.
- The flow — Pick a nickname → create or join a channel → turn the mic on to talk → turn it off to listen. A channel can be public (listed) or private (hidden, password required).
- Hands stay free — One press of the button on your earphones or headset turns the mic on, another turns it off. It keeps going with the screen off or while you use other apps.
- Tuned for riding — Noise reduction for wind and traffic, three ways to keep listening to music while you talk, a choice of output between phone speaker, earpiece and Bluetooth, and an incoming call automatically mutes the mic and hands it back when the call ends.
③Good for
- Group rides by bike or motorcycle — The front and the back of the group share signals, stops and hazards at once.
- Hiking, trekking and camping — Stay in touch when the group spreads out, with no range limit.
- Events and on-site coordination — Staff give and confirm instructions hands-free. Designated speaker mode lets only the host talk.
- Travelling in several cars — Car-to-car contact and updates from the car ahead or behind.
- Work sites and shops — Call a colleague who is somewhere else on site.
- Family outings — Tell each other where you are when you split up with children.
④Why it is worth using
Free
There is no charge, no radio hardware to buy and no extra carrier fee.
No range limit
Anywhere the internet reaches — across the country or abroad — shares one channel.
Voice is never stored
Audio is relayed in real time only and never recorded. Even the operator cannot review or recover a past conversation. The relay server is our own server, so nothing is handed to a third party or sent abroad.
No sign-up
Pick a nickname and start. No ID, no password, no contact details.
Hands-free
Toggle the mic with the headset button; it keeps running with the screen off.
Designed for the road
Noise reduction, listening to music at the same time, automatic handling of phone calls, and a tone that tells you the mic state.
⑤Everything it does, at a glance
- Create and join channels (public / private)
- Talk modes (everyone / designated speaker)
- Toggle the mic with a headset button
- Ambient noise reduction
- Listen along with music
- Choose the audio and mic device
- Keeps running in the background
- Automatic handling of phone calls
- Choice of mic tone
- Host controls (grant the floor, remove a user)
- Announcements
- Contact form
- Korean and English
Features
What the app can do today.
Create and join channels
Public channels are listed and searchable; a private channel is hidden from the list and needs its password. Channel names are 3–20 letters or digits.
Talk modes
In everyone mode anybody can turn the mic on; in designated speaker mode only the person the host picked may talk. The server enforces it.
Toggle the mic with a headset button
One press of the button on your earphones or Bluetooth headset turns the mic on and off. Because the signal reaches the app differently on every device, you teach it once in Settings → Mic button setup.
Ambient noise reduction
Turn the processing that cuts wind and traffic noise on or off in settings.
Listen along with music
Choose between keep playing as is, lower the music while talking, and pause the music when the mic turns on and resume afterwards.
Choose the audio and mic device
Send the sound to the phone speaker (loud enough for people nearby), the earpiece (held to your ear) or a Bluetooth headset.
Keeps running in the background
The channel stays up with the screen off or while you use other apps. On Android, allowing notifications shows the ongoing-session notice.
Automatic handling of phone calls
An incoming call mutes the mic, and when the call ends the mic and the button go back to the channel.
Choice of mic tone
Pick between radio, electronic, low and spoken tones and set the volume. Turning on and turning off sound different.
Host controls
Grant the floor in designated-speaker mode, and remove someone who breaks the rules for 10 minutes or permanently. The host cannot be removed. You can hand the host role over to another member, and if the host leaves the channel the earliest member still in it becomes the host automatically.
Announcements
Operator announcements appear as a dialog when the app starts and on this site. Past ones stay in the announcement list in the app settings.
Contact form
Send an enquiry from the app settings or from this site. Leave a reply address and the answer comes by e-mail.
Korean and English
Both the app and this site are available in Korean and English.
Frequently asked questions
Answers follow what the app and the service actually do.
Does it cost anything?
No. It is free, and there are no paid features inside the app.
Is my conversation recorded?
It is not stored. The relay server passes audio to the other participants in real time and never records it or writes it to a file. That is also why the operator cannot review or recover a past conversation.
How many people can join?
The number of people in a single channel is not limited. The service as a whole does have operator-set caps on concurrent users and on the number of channels, and past the cap you are asked to try again shortly.
Does it use a lot of data?
Not much, because only voice is sent. Reckon on roughly 20–30 MB per hour; it is an estimate that moves with the number of people and the network.
Does it work on both iPhone and Android?
Yes. On Android you download the APK file from this site and install it; on iPhone you install the test build through Apple's TestFlight app. Step-by-step instructions are in the Download section.
My Bluetooth headset button does nothing
The way a button signal reaches the app differs per device, so it has to be taught once. Leave the channel, then open Settings → Mic button setup and press the button as prompted. Setup only works outside a channel. If the headset handles the button itself and sends no signal, use the mic button on screen.
Is it safe to use while riding?
Earphones make it harder to notice what is around you. Use one ear only, or a headset that leaves your ears open, so you still hear traffic and pedestrians. Stop somewhere safe before operating the phone, and follow the local rules on wearing earphones while riding or driving. Responsibility for how you ride remains with you.
Can I turn the screen off?
Yes. The channel keeps running with the screen off or while you use other apps. If Android keeps dropping it, allow notifications and use Request battery optimisation exemption in the app settings.
My nickname is gone
A nickname is held for you while you take part in channels. Once you have stayed out of every channel for 30 minutes, someone else may take it.
What happens if I am removed from a channel?
A normal removal blocks you from that channel for 10 minutes; a permanent removal blocks you from it for good. Either way it applies to that channel only and the rest of the service stays open to you. The host cannot be removed.
Do I need to create an account?
No. Just pick a nickname and start. There is no ID or password to create and no contact details are collected.
When does a channel disappear?
A channel with nobody in it is removed automatically after 1 minute(s). It stays as long as someone is connected.
Download
Android installs from an APK file, iPhone through TestFlight.
Installation guide
Download the APK
Pressing [Download for Android] above fetches mpc-1.0.55.apk (32MB).
It is installed from a file because the app is not on Play yet. If the browser warns that "this type of file can harm your device", choose [Continue].
If it will not install on an older (32-bit) phone, get the 32-bit build v1.0.55 instead.
Open the downloaded file
Tap the finished download in the notification shade, or open My Files → Download and tap mpc-1.0.55.apk.
Allow this source (once only)
Android 8 and later block installs from outside the store by default. When the warning appears, choose [Settings] → turn on Allow from this source and go back.
On some phones the path is Settings → Apps → Special access → Install unknown apps, where you allow your browser (Chrome, Samsung Internet).
Install, then open
Press [Install]. If Play Protect mentions an "unknown developer", choose [Install anyway] or [More details → Install anyway].
When it finishes press [Open], or tap the 📻 IeumTalk icon on the home screen.
Grant permissions (microphone, notifications)
On first launch the app asks for the microphone — it is required to talk. Allowing notifications as well keeps the channel alive with the screen off (ongoing-session notice).
With a Bluetooth headset, please also allow Nearby devices.
Exclude it from battery saving (recommended on Samsung and Xiaomi)
Some phones let battery saving kill background apps. If the channel keeps dropping, use Settings → Request battery optimisation exemption in the app.
Install TestFlight
First install Apple's TestFlight from the App Store. Pre-release builds are distributed through it.
Works on iOS 16 or later, on iPhone and iPad. There is no charge.
Open the invitation link
On your iPhone, pressing [Install for iPhone] above opens TestFlight. To open it by hand, paste the address below into Safari.
[Accept] → [Install]
In TestFlight, [Accept] IeumTalk and press [Install]; the app then appears on your home screen.
Grant permissions (microphone, notifications)
On first launch the app asks for the microphone — it is required to talk. Allowing notifications lets you hear about new builds.
With a Bluetooth headset, connect it and then pick it under 🎧 Audio / mic device in the app.
Set up the headset button (recommended)
After picking a headset the app offers Mic button setup. Press the play or call button on the headset once as prompted, and from then on that button toggles the mic. Headsets with only a call button, such as Shokz or BiKom, work too.
While you are in a channel, iPhone shows an "IeumTalk" call on the call screen — that is normal and is what lets the headset call button reach the app. The red button there toggles the mic instead of leaving the channel; leave the channel from the app. Nothing is added to your call history.
With two or more Bluetooth headsets connected, the sound may go to the other one. Pick the device under 🎧 Audio / mic device in the app, and when prompted select the same device in the iPhone settings.
How long a test build lasts
A build installed through TestFlight expires after 90 days. When it does, open TestFlight and install the new one.
Using the app
Recent changes
Release notes are written in Korean.
- 전화가 오면 무전 소리도 함께 멈추고, 통화가 끝나면 듣기·말하기를 다시 맞춥니다 — 안드로이드에서 앱 마이크를 꺼 둔 채 전화를 받으면 상대가 내 목소리를 못 듣던 문제를 고쳤습니다
- 음악 낮추기·정지가 남이 말할 때뿐 아니라 내가 말할 때도 동작하고, 대화가 끝나면 원래 음량으로/재생으로 돌아옵니다 (아이폰은 되돌릴 때 소리 길을 한 번 새로 엽니다)
- 네트워크가 끊겼다 다시 붙은 뒤 앱을 내렸다 올리면 이어폰 버튼이 안 먹던 문제를 고쳤습니다
- 채널 안에서 이어폰을 바꾸면(샥즈 ↔ 에어팟 등) 학습한 버튼 방식에 맞춰 통화 등록을 다시 맞춥니다
- 아이폰에서 전화를 '종료 후 수락' 으로 받을 때 마이크가 뒤집히던 문제를 고쳤습니다
- 발언 중재에서 버튼으로 발언을 끝낼 때도 마이크 끔 소리가 납니다. 어떤 신호음이 울렸는지 앱 로그에 남깁니다
- 신호음 변경 창에서 소리를 골라도 이름이 그대로이고 크기 바가 움직이지 않던 문제(1.0.53 수정분)가 이 버전부터 실제로 배포됩니다
- 채널 안 맨 위에 통신 상태를 안테나와 백분율로 보여 줍니다 — 누르면 왕복 시간·패킷 손실·경로·포트를 볼 수 있습니다
- 붙어 있는 서버 포트를 함께 표시합니다. 중계(TURN)로 붙으면 아이콘과 색이 달라집니다
- 채널 안 좌측 위 헤드셋 아이콘을 없앴습니다 — 아래 [기기] 버튼이 같은 창을 엽니다
- 채널 설정을 저장하면 설정창이 닫힙니다
- 갤럭시에서 폰 스피커를 골랐는데 소리가 나지 않던 문제를 고쳤습니다 — 채널 안에서는 음성 서버(LiveKit)의 한 경로로만 소리 길을 바꿉니다
- 장치를 고른 뒤 실제로 그 기기로 소리가 가는지 안드로이드에서도 확인합니다 — 가지 않으면 알려 줍니다
- 신호음 변경 창에서 소리를 골라도 이름이 그대로였고, 크기 바를 끌면 소리만 바뀌고 바는 제자리였던 문제를 고쳤습니다
- 채널 만들기 창의 [아무나 발언 / 지정 발언]·[공개 / 비공개] 칸이 가운데 글자 위에서만 눌렸던 문제를 고쳤습니다 — 이제 칸 전체가 눌립니다
- 채널 안 [채널 정보] 창에서 발언 모드를 바꿔도 칸이 움직이지 않던 문제를 고쳤습니다
- 마이크 버튼도 버튼 전체가 눌리도록 고쳤습니다
- 연결 품질이 바뀔 때마다 이어폰 버튼 재판정이 취소되던 문제를 고쳤습니다 (통화 버튼 헤드셋이 인식되지 않는 원인 하나)
- 채널을 나가면 남은 알림을 치우고, 그 정리가 엉뚱한 때 일어나 입·퇴장 알림을 삼키던 문제를 고쳤습니다
- 설정 화면을 목업 디자인으로 다시 만들었습니다 — 같은 성격의 항목이 카드 하나에 줄로 모입니다
- 각 줄에 아이콘과 한 줄 설명이 붙고, 지금 고른 값이 줄 오른쪽에 보입니다
- 신호음은 [신호음 변경] 한 줄을 눌러 올라오는 창에서 고릅니다
- 화면 맨 아래에 문의하기·나가기 버튼을 큼직하게 두었습니다
- 채널 목록에서 검색 줄이 제목에 붙어 있던 것을 아래로 띄웠습니다
- 채널 안 정보 창에서 채널 설명 항목을 뺐습니다
- 창이 화면 맨 위까지 올라가 제목과 버튼이 가려지던 문제를 고쳤습니다
- 상태바 글자가 배경에 묻히지 않도록 밝게 고정했습니다
- 설정 화면을 촘촘하게 정리했습니다 — 긴 설명문을 줄이고 항목을 한 줄로 모았습니다
Contact
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