Hi, I want to move to the big bundle on pay and go £15 a month however it says '4G ready' and my phone only supports 3G. Does this mean it only supports 4G or 4G and 3G?
For future reference and if and when you move up to a 4G compliant phone , does your present SIM card say 4G on it. All the new sims being supplied now are.
If it does not then perhaps think about popping into any O2 shop and they'll simswap your Tariff and mobile number from your original sim to a new one.