[burriko]

Unfortunately it seems that GiffGaff won't be offering nano SIM cards for some time yet, so at the moment they are not an option for the iPhone 5. http://community.giffgaff.com/t5/Blog/giffgaff-nano-SIM-upda...

[liedra]

Apparently you can cut and shave them down, but it seems like a bit of a scary thing to try! There's also cutters popping up on ebay which claim to do it. Who knows, though.

[dan1234]

The nano sim is also slightly thinner than a micro sim so it will involve some light sanding as well as cutting[0].

[0]http://www.gizmodo.co.uk/2012/09/you-cant-just-cut-down-your...

[justincormack]

its not that scary...