Nano sim, giffgaff and iphone 5?

Hi yh so basically i bought the iphone 5 which is on o2. I was wondering if giffgaff would work on the iphone 5 (locked to o2), from what i've heard giffgaff and o2 work together thats why i've been trying to trim a giffgaff sim down myself? Also is there any way i could get the giffgaff company to send me a nano sim? From what i know they don't do nano sims for the iphone 5 yet so what i've been trying to do is trim it down myself but i failed… Twice, i cut the sim in half by accident.

I don't like o2, i prefer giffgaff so would it be possible for the actual o2 store to trim down a normal giffgaff sim into a nano sim if i took one to them?

Sim cutter - http://www.amazon.com/...B009AU7H02

GiffGaff is a separate company, and although they use the O2 network they have a different network ID. For example I have a Virgin SIM but it uses the Orange network, if I put an Orange SIM in my Virgin phone it won't work. You'll need to unlock the iPhone to use a different supplier - go to http://safera1n.com for the software.
Also have a read of - http://www.officialwire.com/pr/factory-unlockjailbreak-new-iphone-5-iphone-4s43gs-any-ios-including-ios-6/

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