3 stupid questions about classic PAYG

[StupidQuestions]

I think I know the answers but just want to make sure...

I have an active classic 123 sim with ~£15 credit.  If I port in my old giffgaff number, will I (a) stay on the classic tariff and (b) keep my credit?

Also, if I have to top up/buy a bolt-on every 6 months to keep my number, is there a text/email/carrier pigeon to remind me when the 6 months is almost up?  I tend to lose track of time and would hate to lose the number I've had for years because I missed some random date on the calendar.

[MI5 · Accepted solution]

@StupidQuestions 

a - Yes

b - Yes

c - No reminder. You'll need to set one on your phone.

[StupidQuestions]

Thanks! 🙂

[MI5]

Most welcome