att w/o the iphone plan

[petermac24]

my friend doesn't have the iphone plan but has the iphone 3g he bought off someone and he does have a contract with at&t. but with some regular phone. can he just pop in the sim card from his old phone into the 3g? will at&t detect his sim is in a 3g and automatically make him add the iphone plan to his contract? or is he free to use the phone like a regular phone. (no 3g capabilities of course) it's an iphone 3g 3.0 jailbroken

edit: if they can automatically detect it and add the iphone plan to your contract. does it being jailbroken prevent the detection?

 

[Applejuiced]

They can tell exactly what phone you're using to acess their network the second you put your sim card into the phone and turn it on.
They wont force into a data plan though if you dont want one.
Just tell him to call up and have them put a data block into his account before he puts his sim inside the iphone.