Why can't I get my ZTE Cymbal (pre-paid, phone in a box) unlocked from Verizon network? I read policy. Phone meets one of the criteria. Phone says it is network locked. Nothing on packaging says this device is exempted from policy, yet I've been told it cannot be unlocked. I want to move to another carrier (PagePlus (PP)) for cheaper monthly service. PP confirmed phone is compatible with their service. Must I have active pre-paid service with Verizon before attempting switch?