I get mixed info on the E4. There are several different model numbers.
Specifically I'm looking for the model that is universal unlocked to use on any US network/carrier right out of the box with no hassle and ability to change prepaid carriers/network types when ever I want. I see one with a model number of XT1768 which appears to be the one?
Then there's the XT1767 which says unlocked Verizon. Does that mean you couldn't move to a GSM network/carrier?
Does the E4 have the Verizon VoLTE compatibility ?
Does the E4 support OTG ?

As a side, does Motorola make any that meet the above (unlocked, VoLTE, OTG) but have a smaller display....like maybe 4.5"?