The History of Cellphones

By: Maria Alvarez

Before Cell Phones

Radios were the first form of cell phones

They were mainly used by the police

Were first used by the police department of Detroit

The First Cellphones

Was only capable of making and receiving calls

Battery life was only about 20 minutes

The concept of cellular phone was produced by Bell labarotories

The first phones were like “bricks” and weighed about 28 ounces

Very large expensive instruments

First available to public in 1984

Martin Cooper

Motorola researcher He was the first to ever

make a phone call using a cellular phone on April 3, 1973

Founder and CEO of ArrayComm

Stated that he was inspired by Star Trek to develop the cell phone

How They Worked When the cell phone was

activated you needed a SID

SID- 5 digit number that is assigned

Control channel is responsible for allowing the phone and base station to communicate about call set-up and channel changing

Second Generation Phones

During the 90s second generation phones were introduced

it was easier to make calls using 2G cell phones than the first generation mobile phones

2G phones had a faster network so the chances of calls being dropped decreased

The 2G cell phones didn’t resemble bricks

Advancements

2G phones introduced many new things

The first SMS text sent from one person to another was in in 1993

The first camera phone was the Sharp J-SH04, introduced in 1999

Third Generation

3G phones are very common these days

New 3G phone models are still coming out

They can also be used for SMS texting, email, and access the internet

Some are capable of using WiFi and streaming radio and TV shows

Safety and Risks

Early models of phones emitted radiation which caused health issues, such as brain cancer and sleep disorders

Using cell phones while driving can lead to car accidents

Interferes with medical devices