I have a 4GB iPhone, using a 3G 64k Cingular SIM Card (AT&T). I currently have firmware version 1.0.2, and do NOT want to brick my phone or cease it from functioning correctly, because I love my iPhone . So, this brings me to my question:
Can I upgrade to the new firmware, because technically I'm still on the AT&T network?
Thanks so much,
P.S. Does anyone know if using the same carrier (AT&T in my case) but different SIM card (Prepaid in my case) changes the baseband of the iPhone or is considered "Unlocked"? Because if it does, then I think that would mean a "No-go" on the upgrade.