Foreign Sim card snafus

I purchased a Sim Card on arrival in Bangladesh and have several problems:


1) The new card comes with a new phone number but my US phone number still appears on the screen. Why? Will my US number get charged for overseas calls?


2) I was told to switch my mobile network technology to GSM /UMTS. But I can only receive texts using 1XEV, and this setting does not appear to work for phone calls.


Help needed urgently, and many thanks!!

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