Ubiquitous telephony

In the era of instant messaging, video chat and wireless internet, I still could not understand why are we still using array of numbers instead of email address (or, user name-for that matter) to call somebody. For me, numbers are not so easy to remember. Its is hard to associate numbers with someone.
I never be a fan of cellphone anyway, unless it serves much more greater utilities. Isn’t that what all the fuzz about smartphone is about? A phone that has processor better than my PC in early 2000s.
Connecting people meant to be much more convenience, also disconnecting people will be much easier.

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