Tmobile Note 3 black, unrooted, stock. Hi All, Been enjoying the note 3 for the last week or so but noticed a quirk. Maybe it's a restriction on t-mobiles part but it seems as though you CANNOT use wifi calling while in airplane mode, even though your wifi is on. I'm trying to save battery as I'm in a very insulated building while I'm at work (you know 3 feet of concrete ). We have wifi, I have that and connect to it but usually put my phones on airplane mode to turn off the cell/2g/3g/4g. Is this also what happens on other phones?