I am looking for a phone that has the ability to convert spoken words into a text message. I have a family member with Parkinson's Disease, and texting is very difficult for him. I want something that has larger buttons - maybe not as large as those Jitterbug cell phones, though. Or maybe there is a smartphone out there with an app that does this. We have T-Mobile right now, but are thinking of going to a prepaid plan soon. Any ideas?