Starting in 2010, French cell phones numbers will also begin with 07.
Unlike in the US, where cell phones can have any area code (and often the same area code as the owner's home region), in France, no matter what the region, all 10-digit cell phone numbers begin with 06. Evidently those 999,999,999 available mobile telephone numbers are about to be exhausted. That's a lot of cell phones, non?
Since all the 01, 02, 03, 04, and 05 numbers are taken by numeros fixes [land lines], and 08 prefixes are special (often toll-free) numbers, and 09 are telephony/VoIP/internet numbers, that means that the next step is -- egad-- 07.