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
