Sim Swap: Swapping your sim,
this can be performed anytime between 4.30am and 9.30pm
1 Back up contacts to your phone (if need be)
2 For sim swap, log into here https://giffgaff.com/activate
3 Put the 6 digit code in from your new sim, And click continue,
4 On the next page it will show the 6 digit activation codes and sim serial numbers of your current and new sim cards.
5 Click where it says... "Yes I want to replace my SIM"
(for mobile browsers please remember to scroll down to see)
6 On the next page click "yes I'm sure"
then wait up to 30 minutes or sooner (normally about 10 minutes) for activation,
this allows you to keep your number/goodybag and credit etc
ps it may not work if you reported it lost/stolen