How to use GiffGaff on iPhone 5?

I'm wanting an iPhone 5 and I'm wanting giffgaff.

How do I go about this?

Do I have to buy the phone outright from apple, then add the SIM? Or buy it on a contract from apple and then get it unlocked?

As giffgaff only supply simcards, plus calls, texts and data (not phones) you will need to buy the iPhone 5 outright for full retail price. You can get it from an Apple Store, or somewhere like Currys, Argos, etc, on a sim free basis. Don't buy one locked to a network, unless it is locked to O2, as if it is locked to another network, eg Vodafone, the giffgaff sim will not work in it.

Unlocked phones, sim free phones, and phones locked to O2, are the only ones that work on Giffgaff, as Giffgaff uses the O2 network.

If you buy it on a contract, you will be paying twice - once for the contract allowance, and again for using your Giffgaff sim.

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