[m4rk4zuk1]

Alrightey fellas, i have a question that has probably been asked in this forum already but i probably havent seen. i'll cut straight to it.

i have a unlocked/jailbroken iphone on tmobile. i also have an iphone account on at&t that is also under my name but bro pays for it. my At&t acct is available for the 3g upgrade. my question is....

Am i able to upgrade my Iphone to the 3G on At&t's network but still be able to transfer the 3G's SIM back to the 1st Gen Iphone and downgrading the 3G internet plan back down to EDGE so i basically have the Iphone 3G on the side? (for unlocking purposes later) Is this possible? has anyone tried it? Will the 3G SIM work on the 1st Gen iphone?

[Eurisko]

The SIM is irrelevant, 3G is iPhone hardware dependent. You can use your regular SIM in a 3G phone or a 3G SIM in a 1st gen phone, it really doesn't matter.