The blocklist feature offers a proactive way to block spam SMS messages. You can add mobile numbers to the blocklist, and the blocklisted numbers cannot receive messages sent with the corresponding signature. Up to 1,000 numbers can be blocklisted for all signatures.
Before using the blocklist feature, you need to apply for an SMS signature and get it approved.
Log in to the SMS Console.
Select General Management > Blocklist Management on the left sidebar.
Click Add Number.
Select a signature and SMS message type and enter a mobile number.
If you need to add multiple numbers, separate them by pressing Enter (one number per row). Up to 1,000 numbers can be blocklisted for all signatures.
After successful addition, the configuration will take about 5 minutes to take effect. When the status of the number becomes effective, it will be unable to receive SMS messages sent with the corresponding signature.
Removing a mobile number from the blocklist is irreversible, and the number can receive SMS messages sent with the corresponding signature normally.