Your online text service allows you to view a list of people who have unsubscribed/opted out of receiving your messages. You can access this list under the Subscribers->Opt-Out List tab on your control panel.
This page will show you a list of people who have unsubscribed to your text alerts by replying "stop" to any of your messages (as well as those that you have manually unsubscribed by clicking the "Unsubscribe User" on the Message Replies page).
Subscribers listed here will not be able to be added back in unless they subscribe themselves by texting in a keyword for your account or by going to your account's sign-up page.
Start sending mass text alerts with our online text service today at Mobile Text Alerts!