Phone & SMS

SimpleStatsWidget
Displays simple statistics on phone calls and sms

Librem Chat

Peace of Mind+
A flight-mode timer

Meshenger
An Open-Source P2P Messenger

Block6
Block6 is an SMS app that makes it easy to block messages from numbers you don't

Silence
Encrypted SMS/MMS conversations made easy!
PanicTrigger
Helps you and others in case of an emergency

Emerald Dialer
Make calls, view call log

Simple sms remote
Control your device by sending text messages

Sipdroid
A SIP (VOIP) client

Nextcloud SMS
Synchronize your SMS messages with ownCloud

Image SMS
Send very small photos with long text SMS and without MMS or internet

Share my number via QR code
Share your contact information with ease

Device Locator

IMCKTG
Generates ringtones from strings, either as Morse code or spoken text

Blacklist Blocker
Block unwanted calls and/or SMS

ShellMS
Send SMS via Android SDK

SMS Backup+
Backup SMS, MMS and call history to Gmail, Google Calendar or IMAP.

SMS Ping
Send silent SMS

Lumicall
SIP softphone

Auto-Away
Auto respond calls and messages

SMS Scheduler
Lets you schedule an sms to be sent at a specific time

Free Mobile Netstat
Monitor your Free Mobile plan

Serval Mesh
Peer to peer communications

My Contacts
Quickly access your contacts

SIP Switch
Access Internet call settings

Little Sir Echo
Repeat SMS notifications

Ensichat
Decentralized Instant Messenger

SIP Caller
Dial SIP numbers

Dumbphone Assistant
Copy contacts to SIM card and back