Numeric Sender ID Restricted Countries

Some countries and mobile network operators only support numeric Sender IDs. This means the sender name must be submitted as numbers instead of an alphanumeric brand name. Before sending international bulk SMS, it is important to follow the destination country's Sender ID rules to improve SMS delivery and avoid filtering.

If you are not sure whether your Sender ID is supported, you can also read our Sender ID guide or contact our support team for assistance.

Country Network Operator
Brazil Brasil Telecom-Oi, Claro-Americel, CTBC Celular, Nextel, Oi-TNL, Sercomtel Celular, TIM, Unicel do Brasil, Vivo, and other local networks.
Honduras Celtel (Tigo)
Mongolia Unitel Co. Ltd
Pakistan ZONG (CMPak), Warid Telecom, Ufone
Romania Telekom Romania Mobile Communications, Vodafone, DigiMobil (RCS & RDS)

Important Note About Numeric Sender IDs

Sender ID rules may change depending on the destination country, local operator policy, route type, and message content. For countries listed above, we recommend using a numeric Sender ID to help ensure better compatibility with local network requirements.

For more information about SMS routing, Sender ID behavior, and international bulk SMS delivery, please visit:

If you need help confirming the correct Sender ID format for your destination country, please contact our support team before sending your SMS campaign.