Reverse engineered app said that Facebook requests and receives your phone number from your mobile network

Facebook requests phone number

Facebook has recently become in trouble, the company was found to use the user-submitted two-factor authentication mobile phone number to match the user to the real-life network of friends. Obviously, this news caused a stir, but it seems that Facebook always gets the user’s phone number, probably requesting it from the carrier, presumably via an API in the phone app. A new screen discovered by reverse engineer Jane Manchun Wong clearly illustrates this.