Both of them use GSM. Make sure the phone you purchase from AT&T or T-Mobile supports quad-band GSM, not the dual-band type. Also you have to call AT&T or T-Mobile to have the phone unlocked before you use the phone with SIM card bought in China.
AT&T and T-Mobile.
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回複:Thanks.
-NaCl-
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12/31/2010 postreply
21:19:51