I am not sure that its been brought up, but the latest version of Bing Mobile has navigation with voice prompts. I tried it out and found it to be pretty close to the sprint navigation utility. So, it may work ok for you smartphone users that don't want to spend a bunch more on a nuvi or sell your liver to pay for a zumo.
I have windows mobile, not sure if it works on other phones, YMMV.
I have windows mobile, not sure if it works on other phones, YMMV.
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