Neel dai,

check this out. http://www.magicjack.com/

I bought one more than a year ago from their site itself and i guess I paid around $60 for the device. You need ADSL network in Nepal to use this device. And yes they provide you US local number for the device. The charge is $19.99/year and $59.99 for 5 years. No hidden charges and you ain't paying nothing to NTC.

Hope this helps.