Why do some people like to put their mobile phones upside down?

When you say upside down, you mean face down If so, the possible reasons are:

1, he (she) doesn't want to pay attention to the contents of the mobile phone at the moment, so he (she) forces himself not to check it upside down.

2. If someone else is present, it may be because privacy is not exposed.

3, just to show the mobile phone LOGO and let others know that they only remember what mobile phone it is.

I can only think of so much for the time being!