Thank you all very much for your replies - I had already done all of those things and have repeated them again but still no joy. I will have to go into town and take it to the Orange shop if it ever stops raining! Perhaps I need a new phone it is about three years old.
Thank you for your replies, I have now sorted the problem out. I had tried to do it on the 'phone with Orange but was told to take it to the Orange shop which I did. They said it was the sim card and put in a new one and said it could take 24 hours. This did not work so I rang Orange again and this time I was lucky and got a fantastic guy called Daniel who went through everything with me on my phone and it was a connectivity problem. I just had to change the setting to the correct Orange network.
Thank you all for your help.