changing sim-only contract

[Jack33]

Hi

I'd like to change my sim-only rolling contract to one with a higher data allowance. It appears that there is an option of a £10 rolling plan with 10GB of data, which looks like a considerable upgrade on my £13.75 for 2GB contract I'm currently on, but I cannot find a way to switch. 

Please advise how I can do this.

Thanks

Jack

[MI5]

@Jack33 

If you want to switch from monthly to PAYG you need to get your PAYG sim and then migrate your number.

Guide: Migration & porting into O2  

Pay As You Go SIM Card Deals & Offers (o2.co.uk)