Thanks to all for replies to my prev. post about Telenav; I just bought a
Sanyo 8400 (nobody recommended that, but it seems to work well; a bigger
screen would be nice but there were other considerations).

I thought it would be nice to have an earphone to better hear the turn by
turn voice instructions, so I bought a Plantronics 665. I'm disappointed
with this; the sound quality is poor, especially on loud sounds like the
ringing of a called phone, and in general it won't go very loud. If I have
the earphone on my right ear and put the cell phone in my left pants pocket,
the quality suffers badly.

I called Plantronics, and they say that's the way it is, blame it on
Bluetooth.

Maybe so, but does anyone have a suggestion for an earphone to use in a
fairly loud car? It's actually a convertible, but I gather no one has a good
solution for windnoise.

Back to the real reason I bought the Bluetooth earphone: to use with
Telenav. Lo and behold, the voice prompts do not appear on the earphone.
Sprint says this is software, not theirs, but Bluetooth's, but when there is
an upgrade that might handle it, it would be on the phone. (?!) It sounds
like Sprint is just disabling yet another profile, but I dunno. I expect if
I contact Bluetooth, they will blame Sprint.

The Sprint CS guy said the wired earphone should work; I'll try that in the
morning when everything, including me, is recharged. Reverting to a wired
solution sounds  pretty lame; but all in all, counting the number of wires
you have to carry around with you to charge the earpiece, it's not bad at
all.

If anyone has a favorite earpiece, please let me know. Also, if you know a
Bluetooth earpiece/phone/nav service/cellular carrier that play together
well.

John