Question

How to use the sim card of mobile of one country in another country ?

Answer 1

Contact  with the any Sim card network company & convert your sim card network type in that network type which you want.

Answer 2

Hi you can't use your phone or sim in other countries until you unlock your phone from its present network provider ..You can easily unlock the phone through online providers like WickedUnlock.com here they are rendering network unlock code for all mobile models at reliable cost .You first check that whether the code is available for your mobile model ,country and network provider .If yes then pay for it and unlock the phone then freely use it with any GSM sim in any countries ...