dtmf option in mobile

[hurijaam]

Dtmf option in mobile phone? what is the dtmf option in mobile.it appears while we make a call.it asks to send some numbers.what is the use of it?can we do something extraordinary with it?how to use the option.plz reply.
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[Aheir]

У нас русскоязычный форум. Если на клавиатуре нет русских букв - используйте виртуальную клавиатуру.
Does that make sense to you?