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If you send the message programmatically using the Amazon SNS API or the AWS SDKs, you can specify a maximum price for the message delivery. Each SMS message can contain up to 140 bytes, and the character quota depends on the encoding scheme.

In the navigation pane, choose Text messaging (SMS). On the Mobile text messaging (SMS) page, under Sandbox destination phone numbers, choose Add phone number. Under Destination details, enter the country code and phone number, specify what language to use for the verification message, and then choose Add phone number.

The SMS sandbox provides a safe environment for you to try Amazon SNS features without risking your reputation as an SMS sender. While your account is in the SMS sandbox, you can use all of the features of Amazon SNS, with the following restrictions: You can send SMS messages only to verified destination phone numbers.

To receive SMS messages sent to an SNS topic, you need to subscribe a mobile phone number to the topic. You can subscribe a mobile phone number using the AWS Management Console, AWS CLI, or AWS SDKs. Replace 123456789012 with your AWS account ID and +1234567890 with your mobile phone number in E.

Set up notifications Under SMS preferences, select Add your mobile phone number. To the right of Mobile phone number, select Add. Enter your number. Select Continue and OK. Verify your phone number by entering the one-time password that we'll send to your phone.

To add destination numbers In the navigation pane, under SMS and voice, choose Overview. In the Destination phone numbers section, choose Add phone number. On the Add phone number window, for Phone number, enter the phone number to add, and then choose Send verification code.

Implementing OTP authentication using AWS services like Amazon SNS and Lambda can significantly enhance the security of your applications.