The texting program on my phone, t9Word, will not let me type in Nautique, Malibu, Mastercraft, wakeboarding, ballast, raley, ronix, hyperlite, or wakeskate...
I don't know if this is true or not, but I've heard that if you type a word that is not in the T9 vocabulary using the Abc function and then immediately switch back to T9, it will add that word to the list of words that it knows.