Hello, I'm selling FREE giffgaff sims. Giffgaff is a mobile network that runs on O2 in the UK. Giffgaff have one of the best PAYG (Pay As You Go) packages. I'm selling sims with free £5 credit on it (once activated) and free 1st class Royal Mail next day delivery. Only for UK buyers. Hurry up as it is only till the end of March! Thanks