It’s uvda d’chol, even if somehow in some crazy way not assur (and I do not believe that to be true, l’chatchilah). Even if it could halachically be made muttar, do we REALLY need yet another way for people to disconnect from the people around them on Shabbos, be ruder than rude as they ignore people while they type away all day focusing mindlessly on their new (apparently non-electronic, but I don’t believe that, either) toy, that takes away the spirit of Shabbos?
I can see the value of this for a doctor, having less actual chillul Shabbos to do when there is an emergency (kind of like the frei Jew who carries on the Shabbos that he is mechallel, but at least there’s an eruv, so it’s one less averia he is committing). But for the rest of us – do we REALLY need this? On SHABBOS?