Rather than try and promote Salonlite myself, I'd like to quote the post somebody made to our facebook wall over the weekend:
the post is here if you need evidence
https://www.facebook.com/salonlite/...?comment_id=1978398&offset=0&total_comments=3
If you're looking at iPhone / Android apps, we're looking at getting those released
very soon - I'm just not able to give a date until we've gone through the full QA testing!
For those that mentioned it, yes, Salonlite will automatically send out text messages for you, reminding the client and hopefully giving you the same kind of results as the person I quoted
Have a look, create an account, give it a try - it's free, so if you don't feel it's for you, you've not lost out anything by trying it.
www.salonlite.com