So I've had my current mobile & sim for a while (2017), I'm currently on a rolling sim only deal and have just ordered a new 5G mobile (Samsung S22) to buy outright, I'm guessing my current sim isn't 5G compatible but when I try to upgrade online it doesn't give me the option of the 5G plans, do I need to register somewhere that my phone is being upgraded to get a 5G sim so i can then also get a 5G plan?