For telecom operators, it is the most direct and effective way to copy the rich business types and forms in the Internet to the telecom network, such as mobile phone IM, mobile phone payment, mobile community and so on. This also gave birth to the concept of mobile Internet, which benefited from the technological innovation of broadband mobile networks and smart mobile terminals. At the same time, new technologies are constantly developing and improving, which leads to the lack of a relatively stable and mature technical platform for some relatively mature services in the Internet in the telecommunications network, thus making. A simple example is that due to the coexistence of cost performance and various operating systems, the proportion of users of intelligent mobile terminals is not high at present, and it is difficult to support the user base needed for rapid business development. In fact, based on the mature technology of 2G mobile communication, innovative services with Internet elements can also be created, and mobile phone signature (also called mobile phone business card) is a typical example. At first, the signature originated from instant messaging (IM) on the Internet, and later it became popular in Weibo, either to show personality, or to express opinions, or to publish a short message like "I don't have my mobile phone". The wonderful points are well known. Unlike online signatures, mobile phone signatures occur when someone is about to connect to your phone, that is, a friend dials your phone. If you are a user using mobile phone signature service, your friend will display your personalized signature on his mobile phone screen while waiting for the connection, such as: "I'm on my way to Shanghai, I'll contact you when I land", "I'm driving, I'll call you back later", or "I can't answer the phone at an important meeting. It is worth mentioning that all these information can be customized separately. For example, it can be set in advance, and different information can be displayed by time, date, working day, holiday, or even by calling number. From this perspective, the personalized space brought by mobile phone signature has far exceeded the Internet signature.

From the user's point of view, mobile phone signature service is a typical telecom value-added service, which can be customized through SMS, Web, customer service phone and business hall, and signature information can be published and modified through Web or SMS. From the perspective of service operators, the service implementation of mobile phone signature is not complicated, and the service scheme adopts signaling monitoring.

At present, Dongjin Technology, which provides front-end switches for operators to try out this application, has rich experience in the technology and application of multimedia processing platforms. Its main product, Keygoe multimedia switch, as the signaling gathering, collecting, sorting and sending equipment in this service, gathers and collects signaling, sorts out the call of this service according to the called number of the user and the service attributes of the user, puts it in storage, triggers the related service of the service server to complete signaling transmission, and sends signature information to the calling party of this call, and the signature information is sent by flash message or USSD. Because the scheme adopts signaling monitoring mode, there is no need to adjust or transform the existing network, and the original service of users is not affected. Mobile phone signature and other services have brought the mature advantages of 2G mobile network and 2G mobile terminal to the extreme in technology and commerce. For example, China has a huge user base of nearly 700 million, which has brought considerable benefits to business innovators. In fact, this innovation has also aroused the industry's interest in fully tapping the potential of existing network technology.

Similarly, based on the technical platform of mobile phone signature service, enterprise operators can develop many new types of applications, such as enterprise customers can publish enterprise information, commodity information or discount information to all users who call. The latest application at present is the application of electronic coupons. That is, after a mobile phone user enters a certain area, he dials the service number, and the user's coupon application request is sent to the service platform. The service platform requests the location information of the mobile phone from the core network through MAP signaling, and after obtaining the location information, he searches the service database for the preferential information of the business circle in this location, and then pushes it to the user in the form of a classified menu. Through interaction, users can get electronic coupons provided by some merchants in this business circle. Because this service is a service for callers to apply for coupons on their own initiative, it avoids the intrusion on users and legal risks involving users' privacy, and has good development potential.

The existing mature technology does not mean that the application is exhausted. These innovative applications based on existing networks and terminals also provide useful ideas for the development of emerging technologies.