can we just put a gsm sim card to get gsm service
or must via sprint or have sim lock?
I don't think there's a GSM lock, but the phone is useless without a CDMA carrier. There's no ability for "data roaming" onto GSM networks, essentially taking the smart out of the smart phone without some CDMA carrier. If your idea was to buy the phone and use your AT&T or T-Mobile sim on it, all you'd be able to do (if it's GSM unlocked) is make phone calls.
Motorola Atrix might be a good alternative for you, though it's not quite as good as the Photon.
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