How do I deactivate a broken iphone 4s and switch to an old iphone 4s a friend gave me?
You can call Verizon customer support @ 1 (800) 922-0204. They should be able to deactivate your phone and activate the replacement. Even in the case of newer phones that are unlocked like the iPhone 6 - you still need a Verizon rep to activate the device after placing the SIM in it due to how their network is configured.