So I got an Unlocked/No Contract Verizon phone, removed my straight talk sim card from my 4S, trimmed it to the correct size and put it in the iPhone 6. I got service and everything started working right away, except I'm not getting 4G service. I've checked in the iOS settings and LTE is enabled. My local area is supposed to have 4G LTE service. Do I need to but a new sim card to get 4G and/or LTE service? What am I missing?