Yes it can be unlocked from the T-Mobile Network lock,then you can use it any GSM Network Sim card...I don't have the code with me sorry,no one give the code for you because it differ network to network,model,IMEI,Country etc...they gather from Network Data base...Service provider will not give the code soon.they ask you to wait until contract end..so you can get from here Superunlockcodes.com  and unlock it from Network lock,then use with GSM Network in Nepal....You cannot use it with CDMA Network Sim card after Unlock.