The mobile phone network enables wireless communication using mobile devices, such as mobile phones, smart phones or tablets. Mobile phone networks provide the necessary infrastructure and are operated by mobile phone providers. In addition to the access network, which establishes the wireless connection to the terminal devices by radio, a core network exists that connects the individual access points to each other. The core network ensures that mobile users can exchange information with those using other access networks or external networks. The main distinguishing factor between fixed and mobile networks is in the access network. The landline network also uses a similar or the same core network, but, as opposed to the mobile network, uses wired technologies in its access network.