Commenting on the IPad or IPhone can be so frustrating if predictive text is on- it always tries to turn the random letters into a word. After about the millionth bout - the last one being the iPad trying to turn hrtdmec into heretic(!) , I accidentally discovered a trick. I type the code, then other random letters until it stops predicting. Then I erase the extra letters. For example, when I typed hrtfmecsh, the prediction stopped turning up, and I just erased the SH at the end. Probablyas clear as mud, but I hope helpful!