rvice layer. Success Factors: Services 1 Östen Mäkitalo in Sweden has proposed the following criteria for successful services (also mentioned in Chapter 1): Sufficient security Sufficient QoS Sufficient bandwidth (sometimes included in QoS) Availability of terminals Sufficient coverage Sufficiently cheap and easy to use These requirements are considered later in this chapter. Success Factors: Services 2 Quoting Wireless World Research Forum services have to be attractive, intuitive and easy to use, with personalization and ubiquitous access. The services must also be developed easily, deployed quickly and, if necessary, altered efficiently. Understanding Changing Telecommunications - Building a Successful Telecom Business Regarding the easy-to-use goal there is a concept called 0-1-2-3 that is used by Ericsson. It can be explained as follows: 0. Manuals: no manual should be needed for a user to get started with mobile Internet services. Configuration parameters are automatically sent to the user's phone over the air. 1. One-button access to your personalized homepage: each user has a personalized portal home page that is automatically set up from the start. The user can access the home page through a single push of a button and then personalize the home page to suit individual needs. 2. Number of seconds to service activation: it should not take more than two seconds after pushing the button for a user to access the personalized home page. 3. Number of clicks to services: the design of the solution ensures that no more than three button clicks are required to reach the desired service on the mobile Internet. 5.2 THE SERVICE PLAN 5.2.1 INTRODUCTION For public operators and service providers the service plan develops, when implemented, into the content of the service pages in the public directory. Some promising sources of revenues and promising individual services are found in Chapter 4. Establishing a good service plan requires knowledge about all the triangle corners: Telecom business: the selected role. Actor c