The Development of Wireless Technology in the Early 1900's
In 1908 , an inventor named Nathan B . Stubblefield was granted patent by the US government , to develop a wireless telephone technology system . In 1921 , the first use of a radio telephony service was seen on first-class passenger trains that run the Berlin-Hamburg route in Germany . In the US , the first radio receiver was created by the Galvin Manufacturing Company , and it was called the Walkie Talkie . The model was referred to as the Motorola SC-300 . The first persons to use the Walkie Talkie were the police departments , who liked it because it offered police personnel a constant source of communication , even when they were mobile .
Mobile Phone Technology after World War 2
The first official "cellphones" were used by the Swedish Police in 1946 , and it functioned by connecting a hand-held phone to the central telephone network . These early cellphones were similar to two-way radio phones that were utilized in cars and taxis for portable communication . Engineers from Bell Labs in the US also developed a technology or architecture made of hexagonal cells , and these were designed for phone use in vehicles . In 1950 , radio phones were used by the US military for communication and civil services
Cellphone Development in The '60s
The electronic parts and components that are used in today's generation of cellphones were developed during the 1960's . In the 60's cellphone technology was already available , however its use was only restricted to a certain block of areas , because the cell areas were only base stations which covered a limited land area . During these times , calls could be made , but if the cellphone user traveled beyond the boundaries of the cell area , the signal got blocked or went dead .
Cellphones in the 70's and 80's
In 1971 , A US communications company , AT&T , requested a public cellular phone service from the Federal Communications Commission ( FCC ) . The request however ,was only processed after a
decade . The early cell phone frequencies were of 824 to 894 MHz Band to the Advanced Mobile Phone Service or AMPS . The advent of analog cellphone service began in 1982 , and this continued until 1990 .
Cellphones in the 21st Century
In 1999 , the first-ever full-fledged Internet phone service was introduced by Japanese company NTT Docomo . The following year , mobile phone advertising first appeared in Finland , when a free SMS text service was launched , and was sponsored by advertisers . In 2001 , the pre-commercial 3G trial network was also launched by NTT Docomo , and soon after , Sony and Ericsson agreed to create a joint company , which was called Sony-Ericsson , for the development and manufacture of high-end cellphones .