When I signed up with at&t, they gave me a $30 a month unlimited plan for my nokia n82 phone because it wasn't a smartphone in their opinion. Since then, I've switched my sim into a n95 and a n86 and they never said a word about it. Now that I just bought a factory unlocked iPhone, I'm wondering if I can cut my sim down, put it in the iPhone, and fly under at&t's radar once again. I realize this would not work with a jailbroken or even the at&t non-subsidized unlocked phone some of you are buying from Apple. The IMEI numbers of these phones are apparently recognized by at&t almost instnatly. I understand this. But because I'm buying my phone factory unlocked, direct from Apple, I'm thinking at&t would have no way of knowing what I'm doing or be able to recognize the IMEI, just like they didn't know what I was doing when I swapped sims between nokia smartphones. Thoughts?