Cannot change settings to show my new phone number

The My Number field doesn’t actually change the phone number assigned to the SIM/eSIM. Since Sky transferred your number and the new one won’t save there, I’d first ask Sky to confirm that the number port has fully completed and that the eSIM is provisioned with the correct number.

Once they confirm that, go to Settings > Apps > Messages, turn iMessage off and back on once, then check Send & Receive. Your transferred number should eventually appear there and be selectable. Do the same check under Settings > Apps > FaceTime.

Apple says carrier verification of a phone number for iMessage can take up to 24 hours. If it still shows the temporary/old number after that, I’d go back to Sky rather than deleting the eSIM or changing your Apple Account settings.

→ Apple Support – iMessage and FaceTime activation

The problem is now sorted. I phoned my carrier and eventually solved the problem. Go to Settings/General/Transfer or Reset iPhone/Reset then ‘Reset Network Settings’. Phone then restarts and the correct phone number was shown.

Thanks for the reply. Sky confirmed that the transferred number has ported. Tried all the above (many times) but without success. However despite the wrong phone number being shown, I am receiving calls when people dial my proper number. Likewise with text messages but on the Settings for FaceTime, Messages and Phone number the wrong number remains - no matter how many times I switch the phone on and off. Amending the number manually doesn’t work - the ‘Save’ button remains greyed out. Out of interest I rung the ‘wrong’ number from my landline just to see if my iPhone would ring - it didn’t. The number was not recognised. So my phone is usable but the Settings displays are just wrong. Is the phone faulty ? Should I wait longer (it’s now 6 days since the number was ported).