Many phones had great waterproof ratings with a headphone socket. Nearly all phones today are thick enough for sockets, a 3.5mm would fit fine on my Pixel 7 pro

Many phones had great waterproof ratings with a headphone socket. Nearly all phones today are thick enough for sockets, a 3.5mm would fit fine on my Pixel 7 pro. The thinness wars ended when too many people sat on their phones and bent them.