How Easy Is It to Hack a Cell Phone? Pretty Easy

From CNN:

An increasingly popular technology for extending cell-phone coverage ranges had a major security hole that went undetected for years, through which an attacker could eavesdrop on everything a target did on their phone, according to new research released on Monday.

The research brings to light previously unknown vulnerabilities in some models of femtocells, devices that mobile network operators use to bring wireless service to low-coverage zones. The compact boxes, which are typically as small as a standard cable modem, can be deployed in hard-to-reach spots like the top of an apartment building or a home in the mountains. Femtocells are also referred to as "network extenders," and analysts project that as many as 50 million of them will be in use by 2014.