That's a helpful reminder StarDreamer thank you. I've just upgraded my mobile but transferred the number with me, so no problems there. But for anyone moving house, it's a useful thing to remember.
If you are someone's next of kin and you get a new telephone, please remember to notify the person so that the person can have it updated on their medical record at the health centre.
This applies both to landlines and mobiles.
It would be good if a notice to this effect were on the box of each mobile telephone sold.