I have not used that braille display, but I can say that Brailleback is terrible on Android. I couldn't get the Brailliant BI 40 to connect a lot of the time, and when I did it would disconnect frequently. I got an iphone again, but I don't know what we're going to do because the newer phones are just getting more visual, with more stupid features nobody actually needs. I got an 8 plus, because anything newer just gets insane for the price and doesn't end up being that helpful. Brailleback still doesn't do contracted braille input, so if she needs that, definitely would have to get an iphone. Also on a display that size, you'll likely want to be aware you'll get UEB by default and that's not optimal for smaller displays. Well, it's not optimal at all, because it's buggy as hell for translation, and doesn't solve the problems it claims to solve, but that's another thread. I only bring up UEB here, because it's buggy as hell on contracted input on all operating systems on which I have tested it.