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2. Line2 - Wikipedia

   en.wikipedia.org/wiki/Line2

   It provides similar service to applications like Skype, which also allow users to place calls over the Internet for a smaller fee than using a regular phone line. Calls can be made over Wi-Fi, a 3G or 4G phone network, or cellular voice connections. [4] Line2 also gives users two lines; one for business, the other for personal calls.

3. Wi-Fi calling - Wikipedia

   en.wikipedia.org/wiki/Wi-fi_calling

   Wi-Fi calling, also called VoWiFi, [1] refers to mobile phone voice calls and data that are made over IP networks using Wi-Fi, instead of the cell towers provided by cellular networks. [2] Using this feature, compatible handsets are able to route regular cellular calls through a wireless LAN (Wi-Fi) network with broadband Internet , while ...

4. Cellular network - Wikipedia

   en.wikipedia.org/wiki/Cellular_network

   A mobile phone is a portable telephone which receives or makes calls through a cell site (base station) or transmitting tower. Radio waves are used to transfer signals to and from the cell phone. Modern mobile phone networks use cells because radio frequencies are a limited, shared resource.

5. Mobile phone - Wikipedia

   en.wikipedia.org/wiki/Mobile_phone

   Two decades of evolution of mobile phones, from a 1992 Motorola DynaTAC 8000X to the 2014 iPhone 6 Plus. A mobile phone, or cell phone, [a] is a portable telephone that allows users to make and receive calls over a radio frequency link while moving within a designated telephone service area, unlike fixed-location phones (landline phones).

6. Duplex (telecommunications) - Wikipedia

   en.wikipedia.org/wiki/Duplex_(telecommunications)

   A duplex communication system is a point-to-point system composed of two or more connected parties or devices that can communicate with one another in both directions. Duplex systems are employed in many communications networks, either to allow for simultaneous communication in both directions between two connected parties or to provide a reverse path for the monitoring and remote adjustment ...

7. List of wireless network technologies - Wikipedia

   en.wikipedia.org/wiki/List_of_wireless_network...

   2G (or 2-G) provides three primary benefits over their predecessors: phone conversations are digitally encrypted; 2G systems are significantly more efficient on the spectrum allowing for far greater mobile phone penetration levels; and 2G introduced data services for mobile, starting with SMS (Short Message Service) plain text-based messages. 2G technologies enable the various mobile phone ...