You see, each and every of my e-bikes is equipped with a Spigen Gearlock smartphone mount (it is based on the principle similar to the popular Quad Lock). Yet the phone I carry is certainly not any expensive iPhone. I stick to Honor phones (Android, by Huawei), which are relatively inexpensive (around 300 dollar), and surely unavailable in the U.S. (you know why)
I admit I lost a single Honor: I didn't notice the mounting screw loosened in one of these mounts. Quad Lock with integrated iPhone case is certainly better but I would indeed hesitate to put a one-thousand-dollar smartphone on the handlebars...