Hi Lucifer and everybody else who tried to help. My grandaughter managed to sort the problem, thank heavens for the much maligned younger generation. Just in case it helps anyone else here is what she did in a nutshell. Go to settings, scroll down to Application manager and select. Swipe to the left to ALL,
scroll down to find the messaging icon (probably out of alphabetical order at the bottom of the list).
Click on nessaging icon. In the next screen you will find 2 boxes marked Force Stop and Enable.
Click on Enable. Now messaging service should be restored, MINE IS.....wow.....!!!!!!!!