on 05-05-2011 08:48
Yes, no problem using giffgaff in either an unlocked phone or one that is locked to parent network O2.
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on 05-05-2011 08:58
Yes you can use a giffgaff sim in a O2 locked phone or any unlocked Phone, you also use O2 Topup vouchers if you can't get hold of a gifgaff one
I'd have a look around for a giffgaff one though, the O2 ones tend to take some getting onto the system, so it can take a while to get it to work
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