on 01-02-2013 19:18
In order to be able to use your phone with giffgaff it will need to be fully unlocked or an O2 supplied handset. This is a guide to unlocking your mobile so you can use it on giffgaff.
If your phone does not appear on the list then the best option will be to have it unlocked at a local High Street store.
on 01-02-2013 19:19
Please also see this useful guide for information on unlocking your phone: