Opt-out

The opt-out option is an operation where a user requests to stop sending him or her advertising materials and messages to mobile phones or chat application.

The opt-out function is mostly used by marketing departments to give the opportunity to unsubscribe from the advertisements users receive.

The use of opt-out varies worldwide and in some countries, the opt-out function is an obligatory part of message text by law. The opt-out or directions on how to opt out is usually placed at the end of a message.
Apps for a chat like Viber have an opt-out option for A2P messages at the top of the chat group.

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