EQO is a freeware software service for mobile devices that allows you to perform the following tasks from your mobile phone:

-Mobile IM: All-in-one mobile IM - AIM, MSN, Yahoo, ICQ, Jabber, GoogleTalk and Skype on your phone.
-Mobile VoIP: Take Skype mobile. Call your Skype contacts or use SkypeOut for cheap international calling to mobiles and landlines.

You can Send text & picture messages as well as Text and IM your buddies for free from your mobile device via GPRS/internet.

EQO now supports Blackberry and Windows Mobile based devices.