Sipdroid is an open-source SIP client for Android.
What's New in This Release:
· Fixes lockscreen issue
What's New in 3.0:
· TLS Security
What's New in 2.9:
· Quick fix for Jelly Bean
What's New in 2
Skuku - Make and receive calls and SMS when abroad using your SIM card and cellular identity without roaming charges.
Notes:
Cannot be used for emergency calls.
Requires a Wi-Fi connection.
Using Skuku Roaming service requires root access
Skype - Skype-to-Skype calls over 3G or WiFi ? Call phones abroad at great Skype rates ? Instant message one or many friends at the same time - Data plan or WiFi connection required (calling in U.S - WiFi only) - Some handsets (e
Skype - With the Skype app, you can make free Skype-to-Skype calls, and send and receive IMs for free, one-to-one or with a group. You can also call phones at Skype’s great rates – over WiFi or 3G.
To make calls to phones abroad, simply dial the number in Skype and pay with Skype Credit – or make unlimited calls with a subscription
Smart CallBack - Smile. Talk to your friends for FREE or save up to 90% of your phone bill to any phone anywhere. Download the app and sign up at www.smartcalls.mobi. Just fill in your number and target number, we will connect you. No contract. Works anywhere in the world on both Wi-Fi and 3G. No high roaming charges. Bypass your current operator
Talk360 - Cheap Calls - Over 4 million people worldwide use Talk360 to stay in touch with friends and family, keep costs low on their travels or use as a back up for when their contract minutes run out
TeamSpeak 3 for Android - TeamSpeak is a cross-platform VoIP software, operating under a client-server architecture, that allows you to enjoy voice group chats with other users in real-time
toolani global - No matter if you’re staying home or abroad, with toolani wifi you’re calling from as low as 1 cent per minute – with no roaming charges at all! toolani wifi works with state-of-the-art web 2.0 technology and provides best call quality to over 230 countries
Ventriloid is an open source Ventrilo 3.x client with a familiar UI. Ventriloid is based on the Ventrilo library for Linux created by the developers of Mangler.
I am in no way affiliated with Mangler, its developers, or Flagship Industries, Inc