You may contact to your network provider Samsung SGH-M310 Unlock Code, they will provide you a code with easy to follow instructions on how t unlock your phone. I suggest to visit Samsung Unlock Code, they can open up all networks for you where you want to use your phone. Once your phone is unlocked, it will work with any networks worldwide without sticking to one network only.
Hope this is helpful.
It is very simple to Unlock your Samsung SGH-M310 by entering Imei Unlock Code . you can get your Mep Unlock Code for SAMSUNG by third party or your network provider.
third party give your Imei Unlock Code within hour. but your network provider take time to give you Imei Unlock Code. and charge huge amount. you can buy SAMSUNG Imei Unlock Code from third party. they will charge little amount.
i hope this will help you.