I am currently an iPhone 5 owner but I want to purchase a Nexus 4 to have another phone to switch back and forth to. And I'm pretty sure, but feel free to correct me if I'm wrong, that the Nexus 4 uses a micro SIM and doesn't have 4G LTE. Can a SIM adaptor be used? Also, what will happen if I use a non-4G LTE phone with my current 4G LTE data plan?