there are times when I'm at my computer, but my cellphone is located
somewhere else. I can open say AIM, and for the recipient put in the
appropriate phone number, preceded with a plus sign (+) and off it
goes. Way back in the day when IM was the "fad", you had to include
the network that the recipient was on, such as +55555555555@uscellular.net
instead of just the phone number. Yeah, I know...geeky. Did I mention at
one time I could do this from plain old DOS? Hehe...that was a LONG time
ago, though I've been known to boot my old Pentium 166 up into plain DOS
even now.