History of cellular phone/ Mobile Phone

A mobile phone, known as a cell phone in North America, is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area.

The radio frequency link establishes a connection to the switching systems of a mobile phone operator, which provides access to the public switched telephone network (PSTN).

 

Modern mobile telephone services use a cellular network architecture, and, therefore, mobile telephones are called cellular telephones or cell phones, in North America.

In addition to telephony, 2000s-era mobile phones support a variety of other services, such as text messaging, MMS, email, Internet access, short-range wireless communications (infrared, Bluetooth), business applications, video games, and digital photography.

Mobile phones offering only those capabilities are known as feature phones; mobile phones which offer greatly advanced computing capabilities are referred to as smartphones.

 

Types

 

  • Smartphone

 

 

Smartphones have a number of distinguishing features. The International Telecommunication Union measures those with Internet connection, which it calls Active Mobile-Broadband subscriptions In the developed world, smartphones have now overtaken the usage of earlier mobile systems. However, in the developing world, they account for around 50% of mobile telephony.

 

  • Feature phone

 

 

 

 

Feature phone is a term typically used as a retronym to describe mobile phones which are limited in capabilities in contrast to a modern smartphone.

Feature phones typically provide voice calling and text messaging functionality, in addition to basic multimedia and Internet capabilities, and other services offered by the user’s wireless service provider.

 

 

A feature phone has additional functions over and above a basic mobile phone which is only capable of voice calling and text messaging.

Feature phones and basic mobile phones tend to use a proprietary, custom-designed software and user interface. By contrast, smartphones generally use a mobile operating system that often shares common traits across devices.

 

  • Kosher phone

 

 

There are Orthodox Jewish religious restrictions which, by some interpretations, standard mobile telephones overstep. To deal with this problem, some rabbinical organizations have recommended that phones with text-messaging capability not be used by children.

Phones with restricted features are known as kosher phones and have rabbinical approval for use in Israel and elsewhere by observant Orthodox Jews.

 

 

Although these phones are intended to prevent immodesty, some vendors report good sales to adults who prefer the simplicity of the devices.

Some phones are approved for use by essential workers (such as health, security, and public service workers) on the Sabbath, even though the use of any electrical device is generally prohibited during this time.

Mobile Network

 

 

  • Pre-Standardisation, or “0G”

AT&T were one of the first to commercialize mobile telecommunication in 1947. The service known simply as “Mobile Telephone Service” (MTS) spread to more than a hundred towns and highway paths by the end of the year. The service relied on an operator to connect both incoming and outgoing calls.

The telephones used were not particularly portable and used a half-duplex “press to speak” system where the caller would have to release the button to hear the other person.

That very same year two Bell Labs engineers proposed the foundations for the modern cellular network. At the time the plans were daring, and it took until the 1960s for the plans to be implemented and even longer to come to market.

 

MTS was used in North America until the 1980s, despite AT&T’s introduction of the aptly-named Improves Mobile Telephone Service (IMTS) in 1965. The new service introduced user dialing, removed the need for operator forwarding and used additional radio channels which increased the number of possible subscribers and calls, as well as area coverage. IMTS was still mobile telephony in its infancy however, and was limited to 40,000 subscribers nationwide. In New York city, 2,000 customers shared 12 radio channels which on average took 30 minutes to place a call.

 

Radio Common Carriers (RCCs) were another solution designed to compete with AT&T’s MTS and IMTS systems. Not only were the units huge  but standards varied widely.

Some phones were half-duplex “push to talk”, some were full-duplex much like a wired telephone. Some lucky customers even carried around briefcase-sized full duplex devices, though RCC units were mainly limited to cars.

In 1960 the world’s first fully automated mobile telephone was introduced in Sweden. The system allowed for automated connection from a rotary handset  mounted within a car, but required an operator to forward calls. The system was known as Mobile Telephone system A (MTA) and was replaced by MTB two years later.

 

In this interim period there were several other solutions including the arrival of Motorola on the scene in 1959 and Bulgarian and Russian  solutions sprouted up too.

It wasn’t until 1971 when the ARP network was introduced to Finland that the world’s first successful commercial network was launched. The system relied on cars, began as half-duplex but soon evolved and had over 35,000 subscribers by 1986.

  • Analog Cellular Networks or “1G”

 

The first generation of cellular networks paved the way to the networks we know and use today. Use of multiple cell tower sites, each connected through a network, allowed users to travel and even switch cell towers during a call. It was a revolution built on existing, analog technology with the first being built in Chicago in 1977.

 

As the Analong Mobile Phone System (AMPS), it was built by AT&T and it took the FCC 11 years to approve AT&T’s initial proposal in 1971 before they were assigned the 824-894MHz range on which to operate AMPS.

 

Hot on the heels of the western researchers were Japanese telecommunications company NTT who built their own network in 1979. Five years later it was the first 1G network to cover an entire country.

Then came the Nordic Mobile Telephone (NMT) network in 1981. Operating in Denmark, Sweden, Finland and Norway, it was the first to feature international roaming

 

  • Digital Cellular Networks or “2G”

 

As technological advancement picked up the pace, so did mobile phones. The 1990s saw the arrival of two new, digital technologies – the European GSM standard and the North American CDMA standard.

Demand grew and more and more cell tower sites were built. In addition to technological improvements in batteries and internal components, this allowed for much smaller mobile devices.

 

Another advancement made possible by 2G was the introduction of SMS messaging, with the first computer generated SMS sent in 1992 in the UK.

A year later in Finland, the first person-to-person SMS was delivered using GSM technology. As popularity grew, pre-paid mobile phones and plans emerged in the late 1990s which further popularized SMS amongst all ages.

 

The very first download services were also introduced using 2G technology and enabled users to download ringtones. Mobile phones also saw use as another method of payment for services like car parking in Finland and vending machines.

 

  • Mobile Broadband or “3G”

 

NTT DoCoMo pioneered the first mobile Internet service in Japan in 1999 on existing 2G technologies, but it was soon replaced with their launch of the world’s first 3G network in October 2001.

Many countries followed suit in the following years including South Korea, the US and the first European 3G networks which sprang up in the UK and Italy in 2003.

While 3G was still being developed a number of “2.5G” services appeared in an attempt to bring older technologies up to speed.

Unfortunately speed was the lacking factor, and while technologies like GPRS and EDGE provided improvements over standard 2G, they did not match the speed of existing 3G technologies.

3G transformed the mobile phone industry and enabled widespread mobile Internet and the transmission services like TV and Radio for the very first time.

Handset manufacturers jumped on the bandwagon and smartphone use took off. By around 2005 3G had evolved a step further, leading many to coin the terms “3.5G” “turbo 3G” and “3G+” in reference to HSPDA (High Speed Downlink Packet Access), HSPA and HSPA+.

  • Native IP or “4G”

 

While no official standards exist for 4G, a few technologies have laid claim to the title. The first was WiMAX, offered by Sprint in the US but perhaps the most successful has been LTE, which is popular also in North America but non-existent in some territories such as Australia.

4G marks the switch to native IP networks, bringing mobile Internet more in-line with wired home Internet connections.



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