You can download aim from the home page(well atleast the default verizon page has a link right to the download) just select the phone model and good to go. Had it on my 7250 and now my 8830
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For verizon, here is what I did. I got Gtalk, free from blackberry and uses the data, not sms. I then linked my other accounts into my Google Talk using a Jabber Transport. No when I fire up google talk I get my Google talk, AIM< and MSN users all in one nice list. OK directions on doing this are found here: Hack Attack: Chat with AIM, MSN, Yahoo, and other contacts over Google Talk
Is there a way to get connected to AIM over a wifi connection for an 8820 on AT&T? I don't currently have a data plan but I was interested in AIM. Thanks all!