The birthday alert SMS feature was completely free for a year or two and was turned off for now until its pricing is figured out. So right now, SMS messages are not being sent, and subsequently nobody is charged for that.
The SMS service has been started a few months ago and it is still free. In your site preferences page you can turn it on and provide your mobile number, and you will receive SMS alerts about birthday and wedding anniversaries in your close family circle, automatically and, for the time being, for free.
good to hear from u, i have turned it on and also given my number i receive a message from the the site that MSG delivered successful but after that i didn't get a birthday alert MSG nor a email from the site i wonder whats the problem