If you need to cancel the contract,you need to call your service provider.You can make request to them to cancel it.But they will ask termination fee .By this way,you can cancel it.But if they will ask you to wait for long time otherwise refuses to cancel the contract,you can better use online site to unlock it.If you need an unlock code to unlock your mobile phone from the network lock,I would suggest you to get it from
http://www.theunlockarena.com/supported-phones/rs13wp7/ at reasonable price.Then you can use any network service provider in it.But you need to pay the pending fee still contract over.