<p>The protocol of the contact method, such as <code>Email</code> or <code>SMS</code> (text messaging).</p> <p>The <code>SMS</code> protocol is supported only in the following Amazon Web Services Regions.</p> <ul> <li> <p>US East (N. Virginia) (<code>us-east-1</code>)</p> </li> <li> <p>US West (Oregon) (<code>us-west-2</code>)</p> </li> <li> <p>Europe (Ireland) (<code>eu-west-1</code>)</p> </li> <li> <p>Asia Pacific (Tokyo) (<code>ap-northeast-1</code>)</p> </li> <li> <p>Asia Pacific (Singapore) (<code>ap-southeast-1</code>)</p> </li> <li> <p>Asia Pacific (Sydney) (<code>ap-southeast-2</code>)</p> </li> </ul> <p>For a list of countries/regions where SMS text messages can be sent, and the latest Amazon Web Services Regions where SMS text messaging is supported, see <a href="https://docs.aws.amazon.com/sns/latest/dg/sns-supported-regions-countries.html">Supported Regions and Countries</a> in the <i>Amazon SNS Developer Guide</i>.</p> <p>For more information about notifications in Amazon Lightsail, see <a href="https://lightsail.aws.amazon.com/ls/docs/en_us/articles/amazon-lightsail-notifications">Notifications in Amazon Lightsail</a>.</p>

<p>The destination of the contact method, such as an email address or a mobile phone number.</p> <p>Use the E.164 format when specifying a mobile phone number. E.164 is a standard for the phone number structure used for international telecommunication. Phone numbers that follow this format can have a maximum of 15 digits, and they are prefixed with the plus character (+) and the country code. For example, a U.S. phone number in E.164 format would be specified as +1XXX5550100. For more information, see <a href="https://en.wikipedia.org/wiki/E.164">E.164</a> on <i>Wikipedia</i>.</p>