- Your phone is currently LOCKED to T mobile network and it wont work with another simcard from another provider.You have to UNLOCK it first,so its possible to use with another simcard.
- Your phone should have 900/1800 frequency band,because outside US&Canada GSM cell service are using 900/1800 band,instead of 850/1900 band which were being used in US&Canada.You can determine your phone by looking at its specification written on the manual or carton box OR simply Google it.