I've done a couple sites in the past that used SMS messaging for notifications -- I found the quickest, easiest was to ask the user their provider and send the

I've done a couple sites in the past that used SMS messaging for notifications -- I found the quickest, easiest was to ask the user their provider and send the notification using one of the email->SMS gateways listed above by Elven. Teleflip is nice. I remember giving them a try a long tim eago, only thing is I remember them inserting their brand into the message. I didn't particularly want that. Also, speaking of Teleflip... I've heard people speculate how they're able to find the correct provider. Anyone know? Initially sending the message to all providers and then seeing which one doesn't bounce back seems spammy, but who knows. (And I suppose if you then cache the results for future requests, it ain't so bad.)