EDISON - Major retailers are able to use shoppers' cellphones to gather information about their shopping habits, and a senator from New York is proposing a method to curb the practice.

Major chains including Family Dollar and American Apparel may be tracking shoppers' habits by using the GPS signal in their cellphones.

Sen. Chuck Schumer (D-NY) says the tracking is too invasive. He says he has written a letter to the Federal Trade Commission asking the agency to require retailers to allow customers to opt out of being tracked. He says he also wants the FTC to mandate that stores indicate they use the tracking system.

Schumer's letter will make the rounds in the Senate to get signatures of support.

Customers who do not want to be tracked can turn off their WiFi or leave their phones at home.