[luanyiking]

unfortunately, I still could not get it to work perfectly. THe network still drops when I move. I think I did everything right.

first, unlock the phone, flash US ratio, the phone works for AT&T, no problem with phone calls.

second, manually set it to GSM mode, search the network manually and AT&T network was added manually. (mode of operation, GSM/UMTS only, GSM network selection manual, current network, AT&T.)

last, GSM/UMTS setting, select your network type : GSM
select your GSM/UMTS band, GSM(1900+850)+UMTS(1900+850)

I think everything should be fine. But network still drops. When it drops, I had to do search network manually. It is not just annoying, it makes the phone not a cell phone anymore. Please let me know if there anything can do. I can send you pics step by step too. Thanks!!!!!