Topic: Centralized phone book

phone book should be based on subscription. When you change your phone number, there is no need to call everybody telling them your new number. You new number will be automatically updated.

Goal is to brainstorm the architecture, how other people who don't have a smart phone would benefit from it, and how this is gonna be profitable

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Senarios:
Exchanging phone number:
Tom and Jerry both have a smart phone. They meet each other at a party and would like to keep in touch. They both turn on their smart phone book and their phones display Tom's avartar (photo, phone number, id etc) on Jerry's phone and Jerry's on Tom's phone. They choose "accept" and the contact info is saved in the online centeral directory. The number would be automatically synchrnozied into their phones should there is a change with their contact info in the future.

Tom has a smart phone, Jerry has a regular phone. Jerry dials Tom's phone number. Jerry's phone number appears on Tom's phone. Using the phone number, Tom's phone finds Jerry's entry in the online directory. Tom save Jerry's entry as his personal contact. They can still keep in touch should there is a change with their contact info in the future. (Zero button press needed!)


is phone number gonna disappear in the future?
would it? Since people can connect via all kinds of online services, and phone numbers will be automatically synchronized. Will people tend to forget the metaphor of phone number? but ... there still needs to have something that could identify a person. A mobile device?

A short term goal:
Facebook & Android phone book synchronizer