O2

Hello everyone!Please, does anyone know the answers to the two questions below?1- How often do I have to top up my O2 Pay-As-You-Go in order to keep my number?2- Is there a minimum amount I have to top up my O2 Pay-As-You-Go in order to keep my numbe...

Hi! How can I top up my O2 PAYG (pay as you go), not having a UK credit / debit card, nor living in the UK? Can I use Paypal? Thank you.