With the advent of the Internet and mobile phones, it becomes more convenient for us to to talk to each other. As a result, some popular pastime mobile devices is no longer as popular as it once was. Since mobile phones and Internet access devices getting cheaper and signal getting better reception, we will see 2 mobile devices vanish in the nearly future.
Citizens’ band (CB) radio is a communication device that allows people to talk to each other using a radio frequency. We say an explosion in the use of CB radio during 1970s. Since the national speed limit had been lowered to 55 mph (90 kph), truckers began to use CB radios to alert each other when they saw speed traps set up by the police.
Now the CB radio is still most used by truckers. Some areas where cellular signals can not be used are also the
A satellite phone, or satphone is a type of mobile phone that connects to orbitingsatellites instead of terrestrial cell sites. It provides the similar functions to any other mobile phones. But, satellite phone can access signal from the entire Earth, or only specific regions.
The satellite phone is first used by military. Now it is still used by army. For the expensive cost, it has exit most common people’s daily life.