My mom is getting a iPhone 6S Plus from Verizon due to her contract ending and her having the free discounted upgrade. I'm currently on a iPhone 6 Plus and she asked if I wanted to swap phones with her since she isn't going to be using it that much. I'm on a T-Mobile. Will I be able to simply pop my T-Mobile sim card into the Verizon 6S Plus and have it working? I heard all iPhone's being sent by Verizon were unlocked out of the gate.