Autocorrect is great when you communicate in a single language, but please remember that a lot of people live a bilingual or multilingual life.
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This is the worst conceivable implementation of spell checking in history, because it's based on a "guilty until proven innocent" principle. I'm usually very much innocent of typos and I shouldn't have to prove to the bleedin' phone that I actually know what I'm typing. I'll be happy to take suggestions for words, though.
Um ... have you tried adding the Spanish (or any international) keyboard?