Who I have the same questioned this topic

When I am writing a text message, my phone has an automatic spell checker of some sort which arbitrarily changes words it doesn't recognize into ones that it does--without alerting me or letting me change back. Many words and abbreviations common to my industry (real estate) do not pass muster with the spell checker. I can't find how to turn it off or make it manual instead of automatic. Have checked the support area online with no luck. Searching under "spelling" and "spell check" yields no results. Please help!