Wenn Du ein Simbian oder Windows Mobile Handy hast kannst Du Fring verwenden:

"[what is fring]

Take all your buddies mobile with fring™, call and chat with them for free and see who’s online before dialling!
fring™ is a mobile internet service & community that enables you to access & interact with your social networks on-the-go, make free calls and live chat with all your fring, Skype®, MSN® Messenger, Google Talk™, ICQ, SIP, Twitter, Yahoo!™ and AIM®* friends using your handset’s internet connection rather than costly cellular airtime minutes. "
Quelle [http://www.fring.com/]

Funktioniert sehr gut und die wichtigsten IMs sind dabei.

http://www.fring.com/