How can a mobile number opt back into a list?
Let's say a mobile number user decided to text "Stop" to cease receiving messages from one of your advertisers. What if that user changed their mind and wanted to opt back in? If you tried to manually upload this number, the system would not allow it due to the user opting out previously. If your advertiser is using a short code, the user would have to text the keyword associated with the opt-in list. If your advertiser is using a toll-free number, the user would need to text "unstop" to the toll-free number. That's it! After that, the user will start getting text messages again.
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