If you mean network unlock then there are services on the net or you'll need to take it into a phone shop that unlocks phones, be sure the shop you take it to support android as not all do.
hi there are many ways to unlock the mobile we can use software ,cable ,codes etc.... among them codes are the best .nowadays there are many online sites found that provide the codes to unlock the mobile.you can get the codes from here http://www.prounlocking.com/ here they ask the following details they are mobile model,country and the network which locks your mobile ,imei number of the mobile .finally they will send the codes to unlock the mobile.