Skuku - Make and receive calls and SMS when abroad using your SIM card and cellular identity without roaming charges.
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
Talkonaut (Android) Mobile IM chat and VoIP application for Android.
· Support for basic core XMPP/Jabber standard for IM chat and Presence.
· Support for SRV domain records while connecting to third-party XMPP servers.
· Support for Google's gmail accounts