Are you signed into a 12 month contract with pay as you go in O2?
My lad is after one but it's a 4 week delivery direct. He's with 3 so just wants sim/contract free.
Nah buying it PAYG is basically sim free, just in O2's case they force you to buy a sim and initial top up with it.
Just buy it, then use the £10 sim (get the 1GB data) as a spare for the month, with it being dual sim can use both.