You can Remove the Network lock from your phone using unlock code.you can get the unlock code for your Samsung D500 phone from http://www.mobileunlocksolutions.com/samsung-d500/rs16wp9/ here you need to specify your country,current Network name, IMEI number of your phone. Then they deliver unlock code to you through mail with unlocking instructions. By using this you can unlock your phone easily.
sahana
September 2013