otti.steinhauer on "send sms from wordrpess"

Hello,

actually I create another plugin. And there is one function I cannot find out how to code it.
There is a form with a field to get a sms-number and a button to send this form, that's OK.
Now I want to send a sms when the button is clicked. For that, I want to create an function like

send_sms($sms){
$message ="myMessage";}

And now I don't know what to do to get $message as sms to $sms. Is there a function like wp_mail()?

Thanks

Ottilie