So, I bought a new phone from giffgaff and recieved a new sim. But as I am already a giffgaff customer, I already have a sim. Is it possible to transfer my current giffgaff number to my new sim, which is also giffgaff?
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do a sim swap if your own sim doesn`t fit http://community.giffgaff.com/t5/Using-giffgaff/What-is-SIM-Swap/ta-p/7320084
goodybag and credit carry across with your number it would normally take around 30 minutes
Sim Swap: Swapping your sim,
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"
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