Texting users don't use the FieldChat app, but may want to see who is in a channel or remove themselves from a channel. The user can send a text message with a * at the beginning, and instead of sending the message to everyone, it will be interpreted as a command.
Remove me from the current channel on this phone number so I no longer receive any text messages from it.
Show me a list of all the users in the channel for this phone number, along with their contact info.
Show the name of the channel for this phone number and the users in it.