Yeah i've considered this option but all depends how steep their prices are.
Also my main concern is regards to actually insuring the phone.
In order to insure an iPhone PAYG you are insuring the actual sim that comes with the phone. So if i was to use a different sim other than the one supplied with the phone this would break the contract of the insurance they do. (i read this yesterday on a forum)
I'm pretty sure, even though will prob be £15 a month that it is best to as if i was to spend around £600 on a phone and then dropped it would be extreamly gutted if it broke.
Would buy PAYG if insurance could be for the phone regardless of what sim you use, that way could transfer my simplicity plan over to the micro sim, keep my unlimited data plan and pay £20 a month rolling contract. Leaving me to upgrade at any time i choose to. OR could do a 12 month simplicity plan so then would def keep unlimited data for at least 12 months. Though wouldn't want to set this up as a 12 months plan now, incase this cant be done that way.