Cablevision Systems Corporation is an American
cable television company with systems serving areas surrounding New York City. It is the fifth-largest cable provider and ninth-largest television provider in the
United States, with most customers residing in
New York,
New Jersey,
Connecticut, and parts of
Pennsylvania. From 2011 to 2013, the corporation also served approximately 300,000 customers in
Colorado,
Montana,
Utah, and
Wyoming under the
Optimum West brand until it was sold to
Charter Communications in 2013. Cablevision also offers high-speed
Internet connections (
Optimum Online), digital cable (
Optimum TV), and
VoIP (
Optimum Voice) phone service (the eighth-largest telephone provider in the U.S.) through its Optimum brand name. As of February 2015, Cablevision also offers a WiFi-only
mobile phone service dubbed
Freewheel.