A report issued by the Federal Communications Commission this week found that 582 million of the nation's 1.3 billion available phone numbers are currently in use. As expected, wireless operators are using a higher proportion of the numbers, with 59.1 percent of the available numbers assigned to them. Perhaps more interesting is the impact number portability has had on phone number availability. The report said that 25 million wireless phone numbers have been moved to new carriers since 2003, when number portability was implemented, while 30 million wireline phone numbers have been moved.

For more on this:
- check out this article from Forbes