AIM on phone?

yes it still will cost you
its just like you sending a text message its their way of ripping people off :)

The service provider (in your case AT&T) doesn’t have anything to do with whether or not AIM is free on your phone. All that tells is it that those service providers allow you the ability to use AIM. However, there’s usually a fee or a requirement of some sort. I found that you need to have web browsing/internet enabled on your phone (unlimited of course) to be able to use AIM for cell phones.

So, you CAN use AIM on your phone, but you WILL have to pay for it unless you already have internet enabled on your phone and built into your cell phone plan.

But sending a text message doesn’t cost me. I have unlimited. So I don’t get charged for every message I send.