My Samsung Galaxy Mega SPH - L600 is locked with SPRINT in the USA and i'm in INDIA and i tried to use the SIM card with a local service provider and the phone says INVALID SIM. i tried to take it to mobile stores here to unlock it but they were unable to do so. Could you please guide me on what the problem is ? is it network locked? or is it a hard locked? and will obtaining an unlock code help?
Could you please help me fix the problem. Any help would be appreciated.