Have to agree, even my ancient OnePlus 3, which has a 5.5" screen, is small compared to many modern phones, and I have it in my back pocket whilst moving around as it doesn't fit comfortable in the front pocket when walking. (I wear jeans about 90% of the time out the house).
It will fit in the front pocket at a pinch (ouch, literally sometimes!), and I tend to do this in crowded places, especially if pick pockets are known to operate in the area.
And for ref, it's not like I have tiny pockets. I'm a 6' bloke with a medium (to slight comfy) build, and the jeans are just regular ones with normal sized pockets.
All that's really needed, is for jeans makers to just make the front pockets deeper, so the phone sits on your flat part of the upper thigh, rather than next to where you bend at the top of your leg.