Originally Posted by swinge
That's a pretty big assumption...what are you basing that on?
Originally Posted by al_bundy
i can understand it's hard to make a GSM/CDMA all in one phone.
what is the technical challenge in making separate phones for AT&T and T-Mo? Even the Nexus One has different models that won't work on 3G frequencies of both GSM carriers
They will need to install a different radio chip for TMobile, but not many other changes (TMobile uses the same GSM tech, but at a different frequency).
I think the "technical challenges" are way overrated. It involves changing one aspect of the network stack, and the critical part (i.e. the software) is unlikely to require too many changes, since its using TCP/IP anyways, and nothing that is based on GSM (although, its possible that some of the S/W optimizations that they apparently worked with ATT for might need to be adjusted).
But even if it did cost them the same as it would for them to develop a new iphone from scratch, don't you think they would find it to be worth it to more than double their US marketshare? Currently, the US carrier marketshare is Verizon, ATT, Sprint, TMobile. This will also open them up to more networks in Canada, and Asia (Europe is almost all GSM)