I have a iPhone4s with a regular plan on Verizon. 450 anytime min with unlimited text and data. I want to know when I switch to the iPhone5 (I am buying it outright) will it just automatically connect to the LTE network since it is an LTE phone? Or Do I need to call Verizon and switch to some LTE network plan? If I do need to switch to a LTE plan, and don't, the phone just will it work just on 3g speeds?