| | Sprint 8830 Sim card question-USA too?
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Ok so I am looking around in the Network settings and I see that you can select CDMA, Global, or GSM for the network, as well as select preferred carriers like T-Mobile, AT&T etc. I tried to hook up to GSM network but no dice. Do I need a USA sim card to be able to get on GSM signal if no Sprint is available? Is this possible in the USA? I read that this phone is "unlocked" so is it a matter of replacing the OEM sim card with one I purchase here? I assume the OEM sim card is for roaming overseas but it would be cool to have it switch to a GSM service in no Sprint areas in USA. I am a newb when it comes to sim cards so any help with this concept is appreciated.