Just joined O2 mobile, from Tesco mobile, as I want to have a cellular connection on my Series 6 Apple Watch. Old number ported across successfully Monday, but when I try to set up the data plan, instead of getting the sign in screen for My O2, I am getting error 106 and a message to contact support. Have tried Support but have got nowhere. Does anyone know what the issue/solution is? Looks to be several people reporting this on various forums, but no resolution to date that I can see.