The UI on most mobile devices are terrible in one way or another. There are zero discoverability, things will hide, lock, block or disappear with no clear way of getting back.
Often I feel it’s easier to go to the computer. As an example: I cannot use the banking app on the phone anymore. In an attempt to make it easier to use, they hid/removed the features I used, such as “how much is in my account right now?” or “pay a bill”. That stuff is now hidden in a complex menu system. I can manage the MasterCard I don’t have though.
Designing good UI is an incredible skill, one that few people gave, and one even fewer are willing to pay for.