Clearly the iPhone is the best phone for the blind. Its' futuristic design and progressive feature set make it the optimal choice regardless of the situation. I'm quite sure that there are several applications on the app store that target blind users. Even if there isn't, there eventually will be, and those apps will be better than the apps offered by other, more primitive, phones. Combine these amazing applications with the iPhone's ergonomic keyboard and you have a match that almost looks like it was designed specifically for the blind.
Furthermore, the iPhone only works on AT&Ts network because Steve Jobs has rid us of the tremendous burden of choice.