Send SMS from website: any recommendations?

[isorg]

I would like to be able to send my website users a SMS when they have, say, received a message in their website mailbox.

Can anyone recommend a good SMS gateway / provider for this purpose? I would like to keep costs as low as possible, and it should be easy to integrate into my website.

Thanks.

[mcavic]

Just ask the users to provide an email address for their pager/phone.

[isorg]

Trouble is, that only works in certain countries, if the phone network provides it.

For example, in the UK, this is not possible.

[Mr Bo Jangles]

It is simple to do - set up an account with gateway provider Clickatell and then one of the options is for you to establish an e-mail-to-sms api account. So, then all you need to is have a script automatically send an e-mail to trigger the SMS.