hello there. well depending on who your service is you may or may not have unlimited AIM. like i have at&t and the unlimited texting plan includes unlimited aim and sms and mms. you could go to your service provider's website and see. also, it depends on the phone. some connect to aim through the internet while others do it differently. to get the best answer you should call your service provider and ask them. that's also the safest (and potentially cheapest) thing to do. good luck.