I've noticed a few members getting into a pickle
regarding access to their account
after losing their phone, or having it stolen.
Check that your Google account, or iCloud account is up-to-date.
Go through the Settings, so you are familiar with what is actually saved.
Please make sure that you can use your email from another device.
If you only have email on your phone,
how are you going to see important messages from giffgaff
if you get the phone stolen, or lose it?
This why giffgaff use email, a text message would be pointless...
So, get ready, before a disaster happens.
Practice reading your email on something other than your phone.
If it is a shared device, you'd be safer using "Private browsing", "Incognito",
that way, the password is not saved,
(make sure that you know it, as it is easy to forget,
if you rely on the phone auto-completing and don't have to type it in regularly).
I'll stop there for now, as this could get quite long!