How to Use a Modem to Send an SMS

1. Download and install an instant messaging utility. These are programs like AIM or Windows Messenger (see References below) that many people have installed on their computers already. Any IM client will do. These programs send messages from computer to computer, but are also capable of sending messages from computer to phone.
2. Open your instant messaging utility.
3. Start a new message. This involves clicking a 'New Message' button or selecting 'New Message' from the 'File' menu in most programs of this type.
4. Type the telephone number (including the area code) you want to send an SMS message to, proceeded by a +1, in the 'Recipient' box. In the end, your phone number should look something like this:+11234567890
5. Type your message into the 'Message' box and hit 'Send.' This will send your text-based message to the cell phone attached to the phone number you entered.