Mobile phones have come a long way since their invention and today, every part of the world is a market for a mobile phone despite its brand or model. 5G is a generation currently under development. It denotes the next major phase of mobile telecommunications standards beyond the current 4G/IMT-Advanced standards. 5G is the fifth generation cellular network technology. 5G Mobile networks are digital cellular networks, in which the service area covered by providers is divided into small geographical areas called cells. Analog signals representing sounds and images are digitized in the phone, converted by an analog to digital converter and transmitted as a stream of bits.

All the 5G wireless devices in a cell communicate by radio waves with a local antenna array and low power automated transceiver (transmitter and receiver) in the cell, over frequency channels assigned by the transceiver from a pool of frequencies which are reused in other cells. The local antennas are connected with the telephone network and the Internet by a high bandwidth optical fibre or wireless backhaul connection. As in other cell networks, a mobile device crossing from one cell to another is automatically "handed off" seamlessly to the new cell.

There are plans to use millimetre waves for 5G. Millimetre waves have shorter range than microwaves, therefore the cells are limited to smaller size; The waves also have trouble passing through building walls. Millimetre wave antennas are smaller than the large antennas used in previous cellular networks. They are only a few inches (several centimetres) long. Another technique used for increasing the data rate is massive MIMO (multiple-input multiple-output).

Each cell will have multiple antennas communicating with the wireless device, received by multiple antennas in the device, thus multiple bit streams of data will be transmitted simultaneously, in parallel. In a technique called beam forming the base station computer will continuously calculate the best route for radio waves to reach each wireless device, and will organize multiple antennas to work together as phased arrays to create beams of millimetre waves to reach the device. The new 5G wireless devices also have 4G LTE capabilities, as the new networks use 4G for initially establishing the connection with the cell, as well as in locations where 5G access is not available.

It is a common human nature to learn about the products before buying. Earlier it was the word of mouth that informed about the products available in the market. Gradually, more official looking reviews tool up the responsibility of informing the customer about various products. Now, the reviews are available everywhere; either it be newspaper, internet, magazines or emails, etc. Mobile phones are available in a wide variety, catering to different customer needs. It is no wonder that