PAY&GO
It's a white sleeve that says O2 Micro-SIM, and then a blue envelope inside that has "O2 Mobile Broadband for Apple iPad" on it. Still works on the iPhone though.
Wont work...... Tried them. They are already active but your number swap wont happen!
There are blue iPhone payandgo micro sim packs, but the stores dont know/ask what ones you need.
Just cut your sim!