I own an Android phone. The first time I tried to send a text from my wife's iPhone, I sent the wrong text 3 times in a row because autocorrect was convinced that it knew the word I wanted and I swear that the word was corrected only after I had committed to pressing the send button. At the time the autocorrect on Android was very mild; it's gotten more aggressive since, but still nothing like Apple's

Yes, every time you send a message from an iPhone you MUST append a trailing space, just to be sure it won't fuck up the last word when it sends.