Much as I hate them,* mobile phones have reinvigorated a part of our language which was hitherto sadly neglected outside of learning to read and clever literary novels: present tense. Before mobile phones, anybody standing at a bus stop announcing loudly, "I am at the bus-stop," or proclaiming, "I am in a shop," whilst paying for their groceries, would have been taken and locked away. Now, I'm not saying it wouldn't be a good idea to lock away the loud and rude mobile-phone-users who do this on buses and in shops, but that's just the way of the world.
Salinger: "The human voice conspires to desecrate everything on earth."
*Or used to. Now it's more a grudging tolerance. I even own one - though, much to the annoyance of friends, I refuse to put any numbers into the thing or have it switched on. Ever.