volved into derstood, and also the technical innovations that in the color screens capable of showing digital photos at good future enable new services. quality. Mega-pixel-capable digital cameras have been added making the device more attractive to use. Thus, 4.2.1.2.1 Internet and IP technology the mobile device has become a multi-purpose device, The Internet and the IP-based services delivered over the not only a mobile phone for voice communications. Internet are more and more going wireless. This means In parallel to the technical development of the mobile that the mobile-communication systems are delivering devices, the mobile-communication technologies are de- more and more IP-based services, from the best effort- veloped to meet the demands of the new services enabled, Internet data to voice-over-IP, for example in the shape and also to enable them wireless. The development of the of push-to-talk (PoC). Furthermore, in the wireless en- digital signal processors enables more advanced receivers vironment it is more natural to use, for example, loca- capable of processing megabits of data in a short time, and tion-based services and tracking services than in the fixed the introduction of the optical fibers enables high-speed environment. Thus, one can talk about mobile Internet network connections to the base stations. In sum, this services in addition to the traditional Internet services enables a fast access to information on the Internet as well like browsing, e-mail, etc. 2 as a short roundtrip time for normal communications. Essentially, IP provides a transport mechanism that is Thus, new and fancier services are enabled by the tech- service agnostic. Albeit there are several protocols on top nical development of the devices, and new and more ef- of IP that are service-type specific (RTP, TCP, etc.), IP in ficient mobile-communication systems are enabled by itself is service agnostic. That enables service developers a similar technical development. to develop services that only the imagination (and tech