There are 8 million phone numbers in the naked city. And no matter who you were calling in San Jose -- or large swaths of the South Bay -- for the past half century, you've had to dial this: area code 408.

But with the explosive proliferation of cell phones, wireless IP addresses and 4G-enabled baby pacifiers, the area code that has served San Jose since neighbors could listen in on each other's party line calls is officially "exhausted."

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