Nimbuzz

Nimbuzz offers limited-availablility-free-calls- and limited-availability-free-text messaging for users via 3G and WiFi. Calls to other nimbuzz users are free. PAY to call mobile or landline phones for as little as $0.02/minute in bulk with NimbuzzOut. Free SIP to SIP calls. With Nimbuzz, you can import friends from popular networks (Yahoo!, MSN Messenger, AIM, ICQ, GoogleTalk, Facebook, MySpace, Hyves) and SIP VoIP accounts. Be sure you have their permission first!