SMS protocol security considerations - AWS End User Messaging SMS
Services or capabilities described in AWS documentation might vary by Region. To see the differences applicable to the AWS European Sovereign Cloud Region, see the AWS European Sovereign Cloud User Guide.

SMS protocol security considerations

It's important to understand the inherent limitations of the SMS protocol itself. Unlike secure messaging apps, SMS does not provide end-to-end encryption, message revocation, or inherent sender authentication, checksum error detection, and in some cases may store SMS in plain text on the device. There are also practical limitations such as message size that can impact how recipients view your message, see SMS and MMS limits and restrictions.