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