whats the actual reason for a cellular phone being smaller in size than a walkie talkie?

Answer 1

Changes in technology and consumer use.

The technology of the walkie-talkie has not changed and there is no significant drive to do so. Companies who use them are not forcing a change to newer technology. Users are not driving for smaller versions nor do they want their employees to 'cart off' the walkie-talkie from the worksite. It does not have to be sleek or slim to do its job.

However, mobile phones used by likely a billion customers worldwide are forcing the market to use the most agressive and compact technology available. Remember, when cell phones first appeared, they looked much more like the walkie-talkie than they do today.

Answer 2

The required length of an antenna for a device to pick up a specific radio wave is based off of the frequency of the radio wave. Ideally the antenna length should be one half the length of the radio wave. Since cell phones operate at a higher frequency than walkie talkies then their antennas can be shorter. In addition to this advances in micro electronics has advanced (obviously) and now allows for smaller electronic devices but since you still need a decent length antenna for a walkie talkie the size of them has been reduced the same amount as a cell phone.

Answer 3

In addition to the other reasons given, the cell phone is typically a lower powered transmitter and that saves component volume.

Answer 4

convenience. People don't want to carry something that doesn't fit neatly into their pocket/purse. so in order for the cell company to make money, the cells need to be small so people WILL carry them and use them.