Hello, I believe my phone at first had an O2 sim and now I have a Giffgaff one, I want to change my provider but when I put the new SIM in it says the network is blocked and to put in the PUK number. Ive put the PUK number of both Giffgaff and my new provider but none seems to be working. Anyone know anything that could help? I need this sim asap.
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If it's asking for a Network SIM Unlock PUK then your phone is locked to a network, and the PUK you require needs to be obtained from that network.
If the phone has been used with both an O2 and giffgaff SIM, then it is locked to O2.
giffgaff cannot unlock it as they are not the network that locked it. O2 will not unlock it unless you become an O2 customer again (temporarily) and are likely to want £15 to do it.
Depending on the make/model of the phone, a high street mobile repair shop may be able to unlock it for less.