Since, there won't be any place to put the sim card on the Spring phones, so it won't work in Nepal bro. Sprint runs in CDMA  network and in Nepal most of our prepaid work in GSM network, So i don't think you can use Epic in Nepal. But still you can talk with some people from UTL in Nepal because it's a UTL is also a CDMA network, See if they can make it work. Good luck. 

bd