It might not happen often, but when you need to find an umlaut (or a similar something), you want it NOW. But where is it hiding?
Here is how you find them: Let’s say you want an “e” with a little accent mark above it. Simply hold your finger on the “e” key, and you will find that several “e” choices appear. Want that umlaut? Touch the “u” and it will be right there. Need an “n” with a tilde? You know how to find it, now.
Try it. Just stroll through the keyboard, touching each key in turn so you can browse the options. Not every letter has options, of course, but I’m sure you’ll find some surprising ones. (Check out the $ sign, and the question mark for starters.)