Phone & SMS

Simple Contacts Pro

Contacts address book for managing recent contacts and vcf contact backups

Session F-Droid

Encrypted private messenger

Silence

Block unknown callers

Red

Redirect outgoing calls to Signal/Telegram/Threema

baresip

VoIP User Agent app for Android based on baresip SIP library

Vibe

Vibrate on a call answer or end

baresip+

VoIP User Agent app for Android based on baresip SIP library

SchildiChat

Secure messenger for Matrix with a traditional instant messaging experience

Jami

Secure and distributed communication platform

FluffyChat

Chat with your friends with FluffyChat.

Element - Secure Messenger

Group messenger - encrypted messaging, group chat and video calls

Wire • Secure Messenger

Wire offers highly secure communication – anywhere and anytime.

Privacy Cell

Verify that a phone is using the most secure cell protocols.

Linphone - open source SIP client

SIP (VOIP) phone

Cheogram

Chat on the Jabber network (XMPP protocol); focus on features for gateway users

Jitsi Meet

Instant video conferences efficiently adapting to your scale

SMS Import / Export

Imports and exports SMS and MMS messages and call logs.

Koler

uniquely stylized phone app with customizable features

FindMyDevice

Locate your smartphone via SMS when it gets lost

Syphon

A privacy centric matrix client

Raise To Answer

Simply hold your phone to your ear to answer an incoming call

Föhnix

The Foehnix weather widget aims at helping pilots with weather conditions

Baby Phone

A pretend phone app for little people who want to practice talking to others.

OpenContacts

A different database for contacts to keep them private only to you.

VoIP.ms SMS

Send and read SMS via voip.ms

kMeet

Free and secure videoconferencing solution

Simlar - free and secure calls

Encrypted and free phone calls over the internet

Simple sms remote

Control your device by sending text messages

SD Contacts

Automatically store your contacts to your SD card

Flash Alert - Call and Message

Blink the terminal when receiving a call, SMS or an application notification