Skip to content

Phone21

Install Phone21

Download Zapstore

Download
QR code for zapstore.dev/download
  • Scan the code with your phone’s camera
  • Tap Download anyway if the browser warns about the file
  • Allow your browser to install unknown apps if Android asks
  • Open Zapstore and finish the onboarding

Open Phone21 in Zapstore

Open
QR code to open Phone21 in Zapstore
  • Scan the code to open Phone21 in Zapstore, or search for it there
  • Tap Install, and Download if Zapstore asks you to confirm the developer
  • Confirm in Android’s install dialog. Allow Zapstore to install unknown apps if Android asks

Claimed by the developer

Twentyone.cz cryptographically proved they hold the key that signs Phone21. The claim is a signed proof on Nostr, tied to the certificate below.

Developer
Twentyone.cz
Developer key
npub1cnahg2n7jquayfkx9qllzaafs3cp4nl2a978afphqq4yn8dz4aes0gd24u
Signing certificate
ee8531250b5b5193458102651d848e95867516e4fc08109e9845c436e27ec4e7
APK checked by
relay.zapstore.devIt read the APK and found it signed with this certificate before listing the release.
Claim published
Nov 12, 2026
Valid until
Nov 11, 2028
Proof event
a022b3f9eaa3d21d9dc6cc4d040b95a1a03601d07ec38aad204fbc3ead290065in relay.zapstore.dev
How trust works

Phone app for your own miniserver. It keeps your SIM card at home and lets you make calls and send SMS from your number anywhere, over a private encrypted network.

Phone21 je aplikace k miniserveru Phone21. Tvoje telefonní číslo (SIM v modemu u tebe doma) máš v telefonu kdekoli na světě: hovory, SMS i kontakty, přes šifrovanou privátní síť. Bez roamingu, bez smluv navíc, platba Lightningem.

Aplikaci nastavíš jedním QR kódem z ovládání miniserveru. Návod: https://phone.twentyone.cz/instalace

Summary generated by Zapstore from source.

Original description, as the developer published it.

Zap Phone21

Zapping anonymously. Sign in to zap with your identity.

Sats go to npub1cnahg…0gd24u, the developer who signed the app’s certificate proof.

Amount in sats

Latest release

Nov 12, 2026

Claimed app Google servicesSource available · GPL-3.0-or-later

Includes Google Play services and Firebase, which can send data off the phone. SMS reading and receiving have no shown use.

Permissions

Nearby devicesCameraNotificationsContactsRead SMSReceive SMSMicrophoneAlways runningSend SMS What they allow
  • Nearby devices BLUETOOTH_CONNECT Find and connect to devices around you
  • Camera CAMERA Take photos and record video To capture images for chat attachments.
  • Notifications POST_NOTIFICATIONS Send you notifications
  • Contacts READ_CONTACTS Read and change your contacts READ_CONTACTS,WRITE_CONTACTS. READ_CONTACTS and WRITE_CONTACTS to save contacts to the device address book.
  • Read SMS READ_SMS Read your text messages Has no shown use.
  • Receive SMS RECEIVE_SMS Receive text messages Has no shown use.
  • Microphone RECORD_AUDIO Record audio To record voice messages.
  • Always running REQUEST_IGNORE_BATTERY_OPTIMIZATIONS Keep running in the background without limits
  • Send SMS SEND_SMS Send text messages Is declared but messages are sent via SIP gateway; system response requests are ignored.

Uses the camera to capture images for chat attachments, records audio for voice messages, and saves contacts to the device address book. Sends call and message traffic through a private tunnel to a user-hosted miniserver.

Release notes

Aplikace Phone21 6.2.4-21p.35 — patří k miniserveru Phone21 0.9.41.

Co je nového

Nový QR kód vždycky přepíše staré heslo. Po změně hesla telefonu v ovládání stačí načíst nový QR kód — dřív si aplikace mohla nechat uložené staré přihlašovací údaje (hlavně po smazání účtu) a dál se přihlašovala starým heslem.

Po načtení QR už účet nezůstane „Zakázáno“. Dřív bylo potřeba aplikaci zavřít a znovu spustit.

Telefon mimo síť jde připojit přes Moji síť. Na obrazovce privátní sítě přibylo vedle nového QR kódu tlačítko Připojit přes Moji síť: otevře se stránka, kde se přihlásíš peněženkou a telefon schválíš. Funguje i na dálku, třeba po ztrátě telefonu — postup je na phone.twentyone.cz/kradez.

Displej během hovoru u ucha zhasne spolehlivě. Senzor přiblížení zůstává aktivní po celý hovor do sluchátka i na telefonech, které obrazovku hovoru při zhasnutí pozastaví.

Volba přístupu je jedna pro telefon i miniserver. Jen hovory, Přístup na miniserver a Vše přes miniserver se nastavují v aplikaci a miniserver se přizpůsobí sám; ovládání ukazuje totéž. Vyžaduje miniserver 0.9.41 a jednou načíst nový QR kód.

Ruční zadání účtu bez připojené sítě nevisí — účet se uloží a přihlásí, jakmile bude síť připravená.

Instalace

Stáhni phone21-release-6.2.4-21p.35.apk níže, nebo aktualizuj přes Obtainium. Po aktualizaci načti v ovládání miniserveru (záložka Telefon) nový QR kód.

Comments

Loading comments…

See more

Get Phone21 the private way

Updates checked on your device, and every release verified before it installs.

Get Zapstore for Android

  1. Tap Download APK below.Scan the code with your Android phone’s camera.
  2. If Android asks, allow your browser to install unknown apps.
  3. Open Zapstore and finish the onboarding.
Download APK

v2.0.4 · 71.2 MB · Android 10+

Verify the download

On a computer, run shasum -a 256 <the file you downloaded>. It should print: b13e01319fecf0b3ba1fd60132758bd0fa08a235836c52d44fddb412cf1b7137

If you have zsp, Zapstore’s publishing tool, zsp utils extract-apk <the file you downloaded> works too. Its hash should be the same SHA-256: b13e01319fecf0b3ba1fd60132758bd0fa08a235836c52d44fddb412cf1b7137

On the phone, AppVerifier should show this signing certificate: 99e33b0c2d07e75fcd9df7e40e886646ff667e3aa6648e1a1160b036cf2b9320

Source code All releases and notes

Get zsp

  1. Download the file for your computer.
  2. Make it executable and put it on your PATH.
  3. In your project folder, run zsp.

Have Go? This does the same:

go install github.com/zapstore/zsp/v2/cmd/zsp@latest
macOS, Apple silicon Linux, x86-64 Linux, arm64

v2.0.1 · macOS and Linux

Verify the download

On your computer, run shasum -a 256 <the file you downloaded>. It should print the SHA-256 for the one you chose.

macOS, Apple silicon · 18.6 MB 99018fb9744e5ace2b44557550dc333496239912c0e9b1137266d4922c803346

Linux, x86-64 · 23.8 MB 1ef5373f8ecd9ba63d2c3fab98abb0d31b2244a2aac31b3749fb205c7d5f5b38

Linux, arm64 · 22.1 MB e421005ee47cba58293dce4277bb784e4cfe706dbbcb8617d671629d0238be18

Source code All releases and notes