Type of mobile

Analog and Digital

*Mobile telephone systems are either analog or digital. In analog systems, voice messages are transmitted as sound waves. When you speak into an analog mobile telephone, your voice wave is linked to a radio wave and transmitted. In digital systems, voice messages are transmitted as a stream of zeroes and ones.
When you speak into a digital mobile telephone, your voice wave is converted into a binary pattern before being transmitted.
Mobile telephone systems are either analog or digital. In analog systems, voice messages are transmitted as sound waves. When you speak into an analog mobile telephone, your voice wave is linked to a radio wave and transmitted. In digital systems, voice messages are transmitted as a stream of zeroes and ones. When you speak into a digital mobile telephone, your voice wave is converted into a binary pattern before being transmitted.

*A mobile device (or handheld computer) is a computing device small enough to hold and operate in the hand. Typically, any handheld computer device will have an LCD flatscreen  interface, providing a touchscreen interface with digital buttons and keyboard or physical buttons along with a physical keyboard. Many such devices can connect to the Internet and interconnect with other devices such as car entertainment systems or headsets via Wi-Fi, Bluetooth, cellular networks or near field communication (NFC).
Integrated cameras, digital media players, the ability to place and receive telephone calls, video games, and Global Positioning System (GPS) capabilities are common. Power is typically provided by a lithium battery. Mobile devices may run mobile operating systems that allow third-party apps specialized for said capabilities to be installed and run.

FDM, TDMA, and CDMA Mobile
*Mobile telephone system all utilize some method to allow multiple users to share the system concurrently. The three methods for doing this are In a FDM system, the available frequency is divided into channels. Each conversation is given a channel. When the system runs out of channels in a given area, no more telephone calls can be connected. In this way, FDM operates much like the channel button on your television set. The AMPS and NAMPS mobile telephone systems utilize FDM.

In a TDMA system, your encoded voice is digitized and then placed on a radio-frequency (RF) channel with other calls. This is accomplished by allocating time slots to each call within the frequency. In the D-AMPS (Digital AMPS) system, each 30kHz carrier frequency is divided into three time slots. In the GSM and PCS systems, each 200kHz carrier is divided into eight time slots. The D-AMPS, D-AMPS 1900, GSM, PCS and iDEN systems all utilize TDMA.

In a CDMA system, your encoded voice is digitized and divided into packets. These packets are tagged with "codes." The packets then mix with all of the other packets of traffic in the local CDMA network as they are routed towards their destination. The receiving system only accepts the packets with the codes destined for it.

Analog systems are FDM. Digital systems can utilize either TDMA or CDMA.

FDM systems typically allow one call per 10Khz or 30Khz of spectrum. Early TDMA systems tripled the capacity of FDM systems. Recent advances in TDMA promise to provide forty times the carrying capacity of FDM systems. CDMA promises to improve on the results of TDMA.

There are many kinds of mobile devices, designed for different applications. This includes:

1.Mobile computers

2.Mobile Internet devices

3.Tablets/Smartphones

4.Laptops

5.Wearable computers

6.Calculator watches

7.Smartwatches

8.Head-mounted displays

9.Personal digital assistants

10.Enterprise digital assistants

11.Graphing calculators

12.Handheld game consoles

13.Portable media players

14.Calculators

15.Ultra-mobile PCs

16Digital media player

17.Digital still cameras (DSC)

18.Digital video cameras (DVC) or
19.digital camcorders

20.Feature phones

21.Pagers

22.Personal navigation devices (PND)

23.Smart cards