Sent from my iPhone: ““Sent from my iPhone”, “Sent using BlackBerry”. Why am I beginning to dislike those little tags at the bottom of email responses?

Because there’s an implied apology built into them.  In longhand, I think they say “I know there may be typos or I may have been a bit terse, but gimme some credit. I’m typing this on 5mm keys with my thumbs while waiting for my sushi, so be happy I triaged your email to be important enough to respond to right away instead of making you wait until tomorrow when it might get lost in my email pile.  Gotta go … mmm, this food looks delicious …”

In fact, one email I received had modified that tagline to read “Sent via blackberry please excuse any typos.” (note the built-in irony of the missing capitalization, comma, and word ‘so’. She may as well have misspelled it “tipos” to make the irony complete)”