1. Cellular
   1. Cellular network operate in most urban and suburban areas around the world and in some rural areas.
   2. These networks were originally used only for voice communications, but have expanded to include data service.
   3. Cellular networks cover a large area. A single tower is able to serve devices up to 20 miles away. The range of a tower depends significantly on the terrain. Unobstructed towers are able to reach much further than towers in a densely populated urban area.
   4. Cellular networks are rated according to the generation of service they provide. Generations are numbered in increasing order of capability. 3G and 4G networks are common. 5G technology is under development.
2. Wi-Fi
   1. Wi-Fi networks are much faster than cellular networks.
   2. Wi-Fi has much shorter range than a cellular signal
3. SATCOM
   1. In remote areas that aren't served by Wi-Fi or cellular networks, individuals might use satellite communications to gain access to data networks.
   2. Devices compatible with these networks communicate directly with satellites orbiting the Earth and therefore, work in almost any location where you can get a clear view of the sky.
   3. Satellite communications are both extremely slow and extremely expensive to use.
4. Bluetooth
   1. Bluetooth allows communications between devices located within about 30 feet of each other.
   2. Bluetooth is commonly used for connections between mobile devices and computers as well as for speakers, headsets, and car audio integration.
5. NFC
   1. Near-field communication or NFC technology uses electromagnetic induction to allow communication between devices that are about 10 centimeters away from each other.
   2. NFC technology is typically used for short, transactional communication such as mobile payments.
   3. Apple Pay and Android Pay use NFC technology to complete secure payment transactions.
6. ANT
   1. ANT networks allow communications between sensors and devices used to manage those sensors and to receive their data.
   2. ANT is a proprietary technology developed by a company called ANT Wireless and is most commonly used for fitness monitoring devices.
7. Infrared
   1. Infrared communications may also be used over short distances but they are problematic because their signal may be blocked by walls, furniture, or even people in between the transmitter and receiver.
   2. You do sometimes find IR transmitters in mobile devices, commonly to provide to the ability to send commands to other devices such as home media components that use infrared remote controls.
8. USB
   1. Many devices have the ability to access network connections on a laptop or desktop computer when connected to those devices by USB. At the same time, a laptop or desktop may also use the mobile device's cellular network when they share a USB connection. That use case is known as device tethering.