The restriction code is the unlocking code to allow you unlock the phone from being useable just on 3 network. It means that you'll be able to use the phone on any network you choose. You can get the code directly from 3, or from a shop or market stall that does phone unlocking. After it's unlocked, you'll need to get the settings from your new company, such as call settings, text, internet, etc. Hope this helps.
Hi,you can unlock your mobile by unlock codes and for unlock codes you can contact your provider or can get it from online providers..try mobileunlocksolutions to get unlock code for your mobile and get it unlocked but before that check whether unlock code is available for your country and provider...