If you've just got your hands on a shiny new Sim card, congratulations. Switching your Sim (the chip that dictates your allowance) can unlock huge savings. Now comes the crucial step of activating it ...

If you’ve just switched over your phone’s data plan to GiffGaff to save some money, congrats – GiffGaff is a solid, reliable network. But how do you actually activate a GiffGaff SIM card? As always, ...