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New registration requirements for SMS
Most customers who are sending or receiving SMS are now required to complete registration for their toll-free or local (long code) numbers.
Failure to register your local numbers (10DLC) with TCR and verify your toll-free numbers with carriers may result in your messages being blocked by mobile carriers.
In future, new phone numbers added to your account will not be SMS enabled by default. For any new number added to your account, you would have to make sure to assign it to a registered TCR campaign (in case of local number) to enable it for SMS.
NOTE: This does not impact phone numbers in your sandbox account, as they are for test purposes and will be enabled with SMS by default. i.e you don’t have to do 10DLC TCR Registration for your sandbox phone numbers.
Some important SMS knowledge base articles: