My husband uses Proloquo2Go on an iPhone because he can still walk, but has little arm strength. The LightWriter was too heavy for him to carry.
It is FANTASTIC! It has changed everything for him. I put it on a lanyard around his neck so he just has to get it into his hand and only needs one thumb to type because the keyboard is tiny. I told him that we could always tape it directly to his hand when it gets too weak to hold it.
It took him awhile to get comfortable & fast with the keyboard (like months). The trick (he tell me) is that the letter is selected when you lift your finger up, not when you touch it. So you can run your finger across the tiny keyboard until you get the one you want, then lift up your finger. Now he can type out a message very quickly.
I cannot say enough good things about the app on the iPhone or iPod Touch. It is a very low cost, light weight alternative to the Dynavoxes of the world. The voices are also much, much better than on the old LightWriter he had been using. He has been to several events (ALS Association, ALSTDI presentation, MDA, ALS Clinic) and always ends up showing it to at least 2 people (at ALS TDI presentation, he was mobbed at the door when leaving by people who wanted to see it).
He also loves the iPhone because he can now text me from where ever he is, plus take photos or videos, and the internet where every he goes. AT&T has a special deal where you can get a data only package on the iPhone (no voice charges) if you have a medical disability. We had to have our neuro do some paperwork, but it saves us all the voice charges per month.
Send me private message if you want more info or additional testimonial
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Lisa