VoLTE let's you make a camera call to another person if their phone is capable of doing it...I think only Samsung and LG do it, they'd s droid-life article that talks about it, I'm sure if u google it, you can find it..
I was disabling a bunch of apps tonight and now I don't have the camera icon on my dialer anymore, though I don't remember seeing the camera this morning either. Looked in turned off apps didn't see any VoLTE, if anyone knows how to get it back lmk..just left a post about it..Thank u