Just use email@example.com as the email address, where 1234567890 is the recipient's 10-digit mobile phone number. That's right, any cell phone number, any mobile provider-- you don't have to know (or care, really) whether the recipient has service from Cingular, Sprint, Verizon, or Joe Bob's Crab 'n' Phone Shack.
For me, this means no more doing manual prefix lookups and then hunting down obscure web forms to send text messages to people. Hooray for automation!
(Thanks to: Phone Phun » Blog Archive » Send an SMS via E-mail)