Your cell phone number could be hijacked unless you add a PIN to your carrier account

DeRay Mckesson is a widely known activist in the Black Lives Matter movement and a former candidate in the race for mayor of Baltimore. He's a high-profile target, and someone finally figured out a way to crack his popular Twitter account--by hijacking his cell phone number, and getting it reassigned to a phone under their control. This was used to push out a message in his account in support of a candidate who he says represents the antithesis of his beliefs. Those tweets have since been delete...