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what is data and signal? Why they are used and how?

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I am guessing you are talking about mobile phones. If you aren't, please correct me.

Signal : How close you are to a service provider hotspot, like EE (UK) and AT&T (US) . The closer you are, the better quality calls and data will be. If you have no signal, you cannot use data, calls or texts.

Fact : There is a mobile phone hotspot on Chomolungma (Mount Everest) !

Data : Basically internet, like wifi, except it runs through Mobile Signal, except much less powerful, and can be expensive. Do not use for video streaming, or large downloads!

Fact : The first data web browser was NOT on smartphone !

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