O2

I have an existing 02 account, contract about to expire O2 SIM only deals are expensive. Ive found a much cheaper deal via Uswitch still with O2. My question is, what is th eprocess to keep my existing o2 number? is it Request do i still need to get ...

I have recently returned to O2. I remember in the past I had to have my sim enabled for use outside of the UK. Is that still a requirement? or am mis-remembering?