If the I-phone 4 is Unlocked Mobile phone it will work in any GSM Network Sim card in Nepal...If the I-Phone 4 is locked means it will not work in NEPAL or any GSM Network Sim card....To Know it's locked or unlocked just insert other GSM Network Sim card.IT accept means it's unlocked phone...It's locked means it says invalid sim or enter unlock code or unlock it message..So you need to unlock it..You can get the Remote I-Phone 4 unlocking service from here Theunlockspot.com/apple-iphone-4/rs10wp9/ and Unlock it.