If you order a sim card from giffgaff (actually O2 network but run by users, for users, and CHEAP!) then I win £5!
And you can keep your number.
Buy a card, activate it and it never dies either if you dont use it. Ideal for an emergency phone.
£10 a month. Unlimited messages, some free calls, real unlimited DATA which is what you need for a smart phone/laptop and NO CONTRACT! One day all phone cards will be like this.
And since I changed 3 months ago, I have gone from 10 uk pounds to 45, just on referals from freinds! So its paying me rather than the other way around! Take a look.
Burgerman. This is the best deal out there, and the only one with worry free unlimited data and pay as you go!