The answer is a string and two cans.
Pay Phones
They wrote to each other by mail.
He died before cell phones came out.
Rugged cell phones are cell phones that are durable and can withstand accidents such as being dropped and handled roughly better than most normal cell phones can.
I'm pretty sure they were called mobile phones before cell phones...
Cell phones use radio waves for communication.
I think it would be a lot different if we did not have cell phones today
Do you mean 'When were the first cell phones sold?' If so, the answer is in the mid 1980s.
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They are used for stuff.
cell phones are mainly used for communicating such as txting, calling and etc...and for entertainment as well and also for emergencies
There are many more than two types of cell phones used worldwide.