I tried using my android phone but I just didn't like it....I found a dedicated GPS works better for me and I have the phone as a back up if needed. The biggest issue was that Nav is processor hog...the phone would rip though the battery and even plugged in it would get very hot...I'm sure the newer phones handle it better. I haven't tried it with my new Galaxy S3 but I have it as a back up if the GPS fails.
"I don't ride to be seen....I ride because I want to disappear...."
"The difference between genius and stupidity is -- genius has its limits."