Hi Daisy,
I have not done it yet, but will do it by the weekend. Just go to Asda Pay as you Go Mobile, (google it or go to https://mobile.asda.com/pay-as-you-go and there is lots of info, and I am going for the one recommended to me, Asda sent the sim within 2 days, but due to hospital visitsI have not had the time or inclination to go further, but I will contact Virgin Mobile for my PAC code tomorrow, to keep my number, and a friend will help me with the rest on Saturday, always private message me if you want to.😉
Good luck Daisy, I still have £10.00 left on my phone, been there for about a year, so will see if it can be transferred, if not I will use it up.
Kindest regards
Barbara xx