How does MMS work on lte?

[mountainbikermark]

On my Incredible I am able to send MMS messages without toggling on the data network, it did it itself, whereas on the Rezound I must toggle on 4g and even then switch from lte with voice to lte/cdma auto via the lteinoff app.
Is this normal behavior for the Rezound (or any 4g phone) or is there a setting to make MMS messages send without toggling data, which I leave off when on wifi.
Thank you

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A Rezound phone was used for this TapaTalk post

 

[pbickel]

I can send photos fine without having my data even on

Sent from my HTC Rezound