Here’s an interesting discovery regarding the 3G iPhone from AT&T. Erica Sadun of TUAW decided to pop in a Pay-As-You-Go SIM into an AT&T activated 3G iPhone and it worked fine. No jailbreaking or any additional modification was done to the phone or SIM. I wonder how long before big brother Steve takes notice of this loop hole. Anyway, it'll probably take Apple some time to provide a fix for this and it'll most likely be in the form of a software update so you'll have the option to fix this or not.
So far, this has only been tested to work with an AT&T SIM. How about you guys out there who are enjoying the 3G iPhone already? Have you tried using a Pay-As-You-Go SIM with it? Share your thoughts on this latest discovery concerning the iPhone.