You can demo using Winlink to send a text message to a cell phone. During the demo have a couple of people enter their cell phone number and their cell carrier - this important as each cell carrier using a gateway to accept messages to deliver as a text message.
Once cell number are formatted, you can copy and then paste into RMS express, connect to a winlink gateway, and your test message (SMS) will be sent.
Note: most services have a character limit of 140 character. If the message is longer, the message will be broken into 140 character chunks.
Enter your Area Code, Cell Phone number and your Cell Phone Carrier