Hi there and thanks for visiting the community. 4G comes to giffgaff in march,so its a very exiting time for both giffgaff and anybody who wishes to use the 4G service.please take a look at both links below,which gives you all the up to date information,thanks .
If you wish to change your current sim card,can you just check the back of your current giffgaff sim card,it will either say 3G or 4G.If it says 3G and you wish to change your sim card for a 4G sim card.All new giffgaff sim cards are now 4G ready and you will need to perform a sim swap.When you perform a sim swap,ALL credit and any remaining goodybag allowance,along with your current giffgaff phone number is transfered to your NEW sim card,easy.
Do you have a spare,un-activated giffgaff sim card ? ,if not,dont worry.Simply order a NEW sim card,by clicking onto your,spread giffgaff,or click onto the link below,and select the correct sim card that you require.