Posted by kevincw01 on 01/18/06 22:46

These days there are not that many providers within the US with all the
mergers taking place. I would agree with Adam that you can just send
them an e-mail. Verizon is 10digitnum@vzw.com I think. At first I was
thinking you could figure out which numbers are owned by which provider
and put that info in a table but with number portability, that concept
goes out the window. So, again, I'd tend to agree with Adam, ask for
the provider.

However, if you're serious about this and you have serious money then
you can buy a gsm or cdma pcmcia card.
(http://www.expansys.com/product.asp?code=GC75) Then sign up the card
for unlimited sms messages. Once it's activated, you can talk to these
cards using standard modem commands and send the sms through your cell
provider's network. To do this using php, you'd just execute a system
command for a shell script on the system with the card that does the
dirty work. Most cell providers allow for cross-provider sms messages
using only a phone number. I.e. send an sms from my verizon network to
someone on the sprint network.

This may seem like overkill, but it's how the big boys do it(minus the
php) and most likely how those e-mail-to-sms-gateways do it too.
-Kevin

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