Gorkhaliproject, Motorola V330 is a Quad-band phone so you dont have to unlock it..You can take it to Nepal and put the sim card and it will work in 900 Mhz... And you dont have to call Tmobile to unlock the phone..You can lock your phone more than 1000 times in a year and it has nothing to do with the service provider.. Hope that helps!! Thanks, ~nepaligurl~