![]() O The imminent exhaust rule requires a company to show that its supply of numbers will exhaust within 6 months before requesting numbers O The fill rate rule requires phone companies to use 75 percent or more of the numbers they have before requesting additional numbers In July 2000, the PUC adopted fill rate, imminent exhaust, and sequential numbering conservation rules:.Pooling has saved an estimated 116 prefixes so far in this area code. Pooling by wireless carriers began November 24, 2002. In April 2000, the PUC ordered a number pooling trial in the 909 area code, which began for wireline carriers on December 8, 2000.Report on the 909 area code in December 2001, which identified an additional 206,000 available phone numbers. The PUC released a report on the utilization of phone numbers in the 909 area code in November 2000, which identified 3.9 million available numbers.In December 1999, the PUC suspended all overlays previously approved in response to customer concern over the 310 overlay and requisite 1+10-digit dialing. ![]() An overlay assigns another area code over the same geographic region as the current area code. In 1999, the PUC approved a two-phase change: a geographic split and subsequent overlay. ![]()
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