Absolutely. The sims break down to any size you want. Start the sim by putting at least £10 on it then you will be given a dashboard and a temporary number. Once that is running go to your dashboard and look for 'keep my number' put your pac code in the box, and on the next page the number you wish to keep. You should then be notified of a changeover day usually three working days ahead . At that time your phone will lose signal, and you should reboot it. If you have an iphone make sure imessage and itunes are off and resync on reboot.