Phones on the trains

Why is there always at least one person on the train carriage who just makes phone calls loudly for the whole journey?

It wouldn't be so bad but each one is the same: 'Hello...Hello...No, no you're breaking up ... Yeah I'm on the train now... I'm on the train now...No, still can't hear you properly, tell you what, I'll call you when I get there, okay? No, I said I'LL...CALL...YOU...WHEN...I...GET...THERE! Yeah...Talk soon.'

Then on to the next call, which sounds very much like, if not exactly the same as, the one before. It's good to know this is an issue over the pond too, though and not just me being fussy.

If your luck is anything like mine there will always be a minimum of one of these people in your carriage on a train, especially if you've got a fairly long journey. Quite often there'll be more than one, so once one person has given up, another starts up again so there's no quiet, unless this only happens to me and I'm doing something to attract them or something. They're even in the 'quiet carriages' too when I've been in them, although I can't remember being on a train with one of those for a while.

Also, train journeys bring up a dilemma (for me at least) when traveling alone. Do you leave the seat next to you free and put your stuff overhead/on your lap, thus making much it more likely that someone will sit next to you.

Or, do you put your stuff on the seat next to you instead; this always seems quite rude I think, and chances are somebody will ask you to move it anyway at some point, but it's less likely and usually the people who do this are the ones who get a double seat to themselves for the whole journey. I hate situations like this, which raise all of the moral questions.