go to Settings->Locale & text to enable the Input Method. Then Long Press any input area to select the input method. pls use soft-keyboard.
You can input Cantonese characters with these Pinyin methods by using another application, "Cantonese Input IME (廣東話拼音輸入法)".
Full version supports English Word Input and Easy Input, which converts "你好"(neihou) from "NH", "neiH", or "Nhou".
*Requires 30MB SD card space