O2

I think my o2 number has been deactivated, I tried to send an SMS to someone and it wouldnt go through and then it showed I had no signal, is there any way to get it reactivated as it hasnt been that long since my number was active and the last time ...

Is there any way for me to top up with a card that isnt registered to a UK address? Is https://www.mobiletopup.co.uk/o2 a viable option for me?