Whilst undoubtedly mobile phones have great advantages, I know I wouldn't be without one, I think it would be safe to say that pretty much everyone who subscribes to GN will be of an age (I think, unless we have some very young grandmothers) who would remember a life without them. The situation described in Sainsbury is one of the obvious downsides, of which there are a few. People walking along texting without looking up and getting stroppy if you don't get out of their way is one of my bete noires, I guess we all have them and for this particular cashier not being acknowledged was one of hers. I agree with a previous poster who said not exchanging a hello at least, relegates them to an inanimate object, so why not use the automated machine. It really comes down to common courtesy and I think unfortunately we are on a downward spiral as far as that is concerned. I don't think it occurs to a younger demographic that they are being ill mannered. I'm always amazed at people who have very public and quite loud mobile phone conversations on a crowded train, sometimes of a personal nature. My son's girlfriend will think nothing of being in the middle of a conversation with us and taking a call without saying, excuse me one moment. I personally find it quite rude but I wouldn't point that out to her because it would probably come across as nit picking. She is like a lot of her generation and this is how they behave with their peers. Our children were not allowed to have their phones at the dinner table when we were having a meal, but my son's girlfriend thinks this is a definite step too far! Sadly with the march of progress, basic things like focusing on the people you are actually with, can get lost along the way.