martina55049
In answer to your first question, I do not know.
Regarding loss/theft of a phone, it is your responsibility to insure against such risks, giffgaff does not provide any cover for such. i.e. you are still liable to pay off the loan extended to buy the phone.
Yes, you can return to giffgaff and transfer your current number.
EDIT to add a point of (hopefully) clarification.
