T9 works OK, and there are other ways too (such as having to push the button multiple times to specify which letter you meant), but I think Hollerith chording i

T9 works OK, and there are other ways too (such as having to push the button multiple times to specify which letter you meant), but I think Hollerith chording is better. (Also, I do not have a mobile phone and I think I do not want one.)