Useful but little do better ...

For a blind person, it can not distinguish the numbers that are on the small handset. They might be of sufficient size roughly, they are backlit orange on black background.

Should be better large white buttons with white writing.

Good point, one can replace each major key image, a number from 0 to 9, for a large keyboard, more visible. But bad point, it is necessary in this case accept the call by pressing the small green button on the handset.

So has avoided for people with AMD.