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Use a mobile IM service with support for AIM, MSN, and ICQ.
Get a mobile IM service for your Android device.
Chat on MSN, AIM, and ICQ on your iPhone.
Heysan: A lightweight approach to iPhone IM
Four companies introduce mobile services for sharing text, photo, or video content to or from your cell phone.
Native iPhone IM apps: Two choices
The best iPhone IM client yet debuts
New and Noteworthy: Apple buys CUPS; iPhone tips, troubleshooting and news