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When the technology was founded: For the person on the beat, and not in a vehicular setting, around 1973.
Why the technology will be around for another 20 years: Not only are mobile phones a means for communicating via voice from one person to another, but the technology surrounding these 'sacred-in-modern-times' devices has long been a platform to expand existing technology.
Only in our lifetimes, the Generation Y have seen cellphones develop into smartphones; a platform for which technologies are added to and the experience of the device enhanced significantly.
The very notion of cellphones becoming moulded into the human design are all but nonsense. Mobile phones nowadays are beyond 'making a phone call' and more a personal assistant-like device, allowing communications beyond the phone call or text message.
Cellphones may not last another 20 years, but smartphones will.