How can I send SMS from VB application

Here's a quick and dirty way which works for us.
1. Most mobile phone providers (here in Greece anyway) provide some sort of Internet site where they will translate an incoming email to an SMS message. The service is usually free but the owner of the mobile phone has to enable it. The address of the email is usually thephonenumber@telco.com

2. send an email (max 160 characters, standard ANSI English) using MAPI or some other method, to the email address that has been set up for the phone number. The telco will do the rest.

This method works for me, I use it to flag industrial alarms to plant supervisors.