Verizon iPhone 5s + have an unlocked SIM and use the same frequencies that TMo LTE has. I have a Verizon 5s on my desk right now with a TMo SIM on LTE.
The Verizon iPhone 5 also has an unlocked SIM and use TMo's HSPA + (4G, not LTE) frequencies
the iPhone 6 is the most universal iPhone yet, withe Verizon & Sprint models supporting GSM/LTE with just the addition of a CDMA radio
got it, cool! thanks ^^^