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It depends upon your own priorities. I would say smart phone becoz its a paradigm shift
Cloud application deployment method!
Satellite Communication.
RF Communication
VIDEO CALLING
I agree with SATELLITE as the5th. But for email, I would rate it around10 since email has been around since1975.
Thank you gents. What about EMAIL
INTERNT COMS FIRST
It is really difficult to point out one as it would differ for each country, but something which is really important and a common denominator for every country and individual would be
batteries
AND
TERRA POWER
