If you already love your mobile, but you don't want to get locked into a long-term contract you can get a great SIM only deal at fantastic value.
There is no long term commitment, all you have to do is put your SIM card into your existing mobile and you are ready to go (if your mobile is from another network it may need to be unlocked). If you decide to take a new contract deal with a free phone at a later date then you're free to switch with just 30 days notice.