Is registering a Sender ID mandatory in some countries to send SMS?

If you want to send SMS messages to countries where Sender ID registration is required, such as Belarus, India, Egypt, and others, it is important to understand the local regulations and requirements for sending SMS messages. In these countries, regulatory agencies or industry groups often enforce rules to ensure the legitimacy and control of SMS communications.

According to the AWS SNS documentation you mentioned, in some places, businesses that send SMS messages to individual customers must use a sender ID that's pre-registered with the relevant regulatory agency or industry group. This means that if you don't have an approved Sender ID in these countries, you may not be able to send SMS messages using SNS.

To ensure compliance and deliverability of SMS messages, it's generally recommended to follow the local regulations and requirements of each country. This may involve registering a Sender ID or using alternative methods provided by local SMS service providers.

It's important to note that the regulations and requirements can vary by country, and it's your responsibility to familiarize yourself with the specific rules and guidelines in each target country. You may need to explore other options or consult with local SMS service providers who can assist you in complying with the local regulations and facilitate SMS message delivery.