If you're not currently with 3, you can transfer your mobile number to your new 3 SIM and we'll give you £10 credit.
How do I keep my number & get £10 credit?
Contact your current mobile network and ask for a Port Authorisation Code (PAC). When you've got your PAC, call 333 for free (from your mobile with the 3 SIM in it), or call 0843 373 333 from any other phone (national rate).
It usually takes 2 working days to transfer your number to 3. When your number has been successfully transferred the £10 credit will be applied to your Pay As You Go account within 7 days (only one credit per number transferred).