What do you think Phone Cases are for? People love phone cases because it gives their devices a bit uniqueness. AirPods also have cases. Other than that for Obvious Reasons Phones all look similar. The shape of your phone is not self expression. However i would hazard a guess if you look into the phone on the home screen you will not find two alike.

Laptop stickers, too; I only entered circles where Macs were popular in about 2012 and it became apparent you should personalize it a bit else it gets lost in the other three dozen macbooks in the vicinity, especially at hackathons / conferences / etc.

YMMV obviously but when I see someone using a phone case it's usually one of those thick rubbery protective ones, or one of those with a flap over the screen that also holds credit cards and IDs. There is a clear utilitarian case for phone cases. Pun unintended.