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Really interesting! I was wondering a few months ago how autocompletion on phones works for agglutinating languages like Finnish, but I didn't have a Finn to ask =/ If you wouldn't mind enlightening me, does it even exist for Finnish? If so, how does it work?

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I can tell you based on Russian that it works poorly compared to English, esp. for verbs. I'd expect to be even worse for Turkish (which I used to know on beginner level), or Finnish. When the word you are typing becomes obvious, it would offer 3 (3 is the default on my keyboard app) random forms that do not appear to take context into account, or if they do they're often wrong. You can either just finish typing, or choose one of those, erase the ending/suffixes and fix them.

Writing Finnish on a phone is terrible until it learns all of your most commonly used words and their most common forms, at which point out becomes merely bad. Whenever I write Finnish using my phone I basically have to work around the keyboard not doing what I want. I'll still swipe to form words, but I have to go back to "fix" them because the system usually can't even handle simple compounds.

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