The opt-in option is linked with getting authority from the subscriber to send promotional materials and messages to his or her mobile number, email, or chat application.

The opt-in function is mostly used by marketing departments to convey unique promotional offers, hot deals, or changes in terms and conditions. Often, the opt-in choice is offered by zero-rated shortcodes which signifies that the user can opt-in without any extra cost per message.

Opt-in is closely linked with opt-out so the users can unsubscribe from the messages they get.

The procedure of using the opt-in varies worldwide and in some countries, the opt-out function is an obligatory part of message text. Instructions on how to opt out are provided 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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