A cell phone rule

It's fine with me if you talk on the mobile. It's also fine with me if you have inane conversations on your mobile (though I would prefer not in my vicinity, but I assume that you [and you know who you are] don't always know you're in the presence of greatness).

But...

If you're having an inane conversation on your mobile (i.e., I and everyone else on planet Earth know it's not your boss or a dramatic family emergency) and because of that you are keeping the long line behind you from moving forward expeditiously because the addition of a mobile is too much for you to handle, you must hang up.

If you are in line within my reach, this may be done for you. That is all.