Sorry but I don't understand why so many are so quick to criticise Bealine's suggestion.
a) It can do absolutely no harm having an entry in your phone
b) If you don't like the idea, don't do it

It was a friendly piece of advice trying to help others - but obviously that means some of you have to be wise ...*s and try and discredit the idea.

5 years ago today terrorists struck London. People looking out for each other is not a bad thing and maybe some of you should say thanks instead.