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Globalgateway can be used to send messages to more than 190+ countries. The API request must contain the numbers with country code, else the message will be failed.
Transactionalconnectivity is used only for India. If country code is not found, the 91 (country's default code) will be appended before all mobile numbers automatically.
SMS App > Manage > Sender ID. Once the Sender ID is approved, you can start sending the messages.