Palm Pre 2 Unlocked GSM P102UEU some region can not connect 2G signal

In my country, i have a problem that's my pre 2 can not connect 2G signal although it has 4 bar signal,
It can connect Edge/GPRS but can not make call, it always drop
when i change to 3G, it works normaly
I don't know why, it happen some region in my country.
i change to another sim card with other provider, it work in 2G normaly.
what happen with my pre ???
sorry for my bad english
Post relates to: Pre 2 p102ueu (Unlocked EU)

My carrier is MOBIFONE (http://www.mobifone.com.vn/web/en/). I'm in VietNam.
when i make a call by using 2G, it's dropped but it can connect to GPRS/EDGE for data (i can check mail). it is not happens when i'm in big city (such as Ho Chi Minh City).
That SIM card is a 3G SIM card. when 3G is actived, it works ok in all region.

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