This invention provides a device for adding a network alarm clock in a mobile phone characterizing in including a short-message central device interconnected with mobile phones by wireless communication network which is interconnected with the alarm clock device, said mobile phone can identify its kind short-messages with fixed form and kinds then convert them to alarm clock information to be stored in its registration and present the alarm clock promptly. The alarm clock device receives its design request to mobile phone numbers and authentifies authorization to generate a registration and form a fixed form and kind short messages of the alarm clock kind to be submitted to the short message center sending said short messages to the mobile phone of a called user. A method is provided for adding network alarm clocks in mobile phones.