Originally Posted by
Dubai Stu
Alternative change the IMEI number on your Apple and identify the phone as an HTC. Look at ziphone's IMEI changing utility.
aside from being illegal, this only worked with 1.x firmware in the iphone 2g and from what i understand, the imei is reset when upgrading to the 2.x firmware. more importantly, since the iphone 3g can't run 1.x firmware at all, there's no way to alter anything. plus, ziphone was fairly buggy and has been known to brick iphones.
as for using a gophone sim, it should work in any iphone. the original 2g phone will need to be unlocked, however, the 3g iphone only needs to be unlocked if it's not tied to at&t (i.e., from outside the usa).
at&t does not support gophone sims on the iphone and will very likely tell you it 'does not work' when in fact it does. the easiest way use a gophone plan is to buy a $10-15 gophone at any major department store and activate it online, then swap the sim card. alternately, get a sim off ebay. at&t discontinued their unlimited gophone data plan last fall, but now there's a 100 meg plan for $20.