AT&T contract iphone 6, LTE->Voice Only option meaning?

Anyone knows that on AT&T contract iphone 6, under settings, then under Cellular, there's one option "Enable LTE", under which you have 2 choices: Off & Voice Only, what do they mean? Especially the 'Voice Only' meaning?

LTE is data, but can also be used for Voice, which in a sense makes voice calls over the data signal or VoLTE or Voice over LTE.

So I will say that if the options are, OFF=turning Voice over LTE off, and Voice Only=Use LTE for voice only, no data. Hopefully an At&T user can confirm or correct my guess.

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