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pay and go phones sim card

Im planning on buying a phone from o2, do i need to use the sim card it comes with(because it tells me i need to choose a tariff) or can i use my current giffgaff sim. (giffgaff sims work on o2 locked phones)

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Registered: ‎04-04-2012

Re: pay and go phones sim card

Your giffgaff sim will work fine mate.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.

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Registered: ‎26-09-2015

Re: pay and go phones sim card

[ Edited ]

I think you need to use the SIM it comes with to unlock your device under that account if you may use SIMs of other carriers. If you will certainly use giffgaff only, usually it should still work well without unlocking the device.