I got mine last week. I sat down read over each item, did some research on the internet, and filled in my vote. It was a long ballot (2 legal-sized pages front and back), and took about an hour. Mailed it in earlier today.
How does doing that on a cell phone improve this? In fact, it sounds more frustrating, because my phone is tiny, may need to be charged, internet connectivity issues, etc.
And really, if we're going to talk about how flawed our system is, this is like one of the more minor points. If you want to get to the root of it, let's talk about how to get rid of the 2 party system, and allow more diverse parties and ideas. That's the real problem.