If you currently have a mobile phone and want to take advantage of a sim only deal it is likely that you will need to unlock the phone from the current network to allow you to be able to use the new sim only card.
Our mobile phone unlocking frequently asked questions section covers the most common questions regarding phone unlocking such as why does a phone need to be unlocked, what mobile unlocking entails, what information you need to unlock a phone, the legality of unlocking a phone and how to actually unlock a mobile phone.