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Menu>Wireless & network settings>Bluetooth (click the checkbox next to Turn Bluetooth on). This should turn on the Bluetooth until you turn it off. What phone are you using?
thanks for the reply man... im on the mytouch 4g. i can only set it on for a short amount of time (somethign like 120 seconds) my nokia n900 was always discoverable. doesnt stay on with the mytouch 4g. any ideas?
I don't know, actually. Just tried it on my Droid X, and same thing. I can turn on the Bluetooth, but when I click Make me discoverable, it gives me a 120 second countdown. Never noticed that before, I rarely even use BT. Maybe someone else will chime in with an app or something.
The 120 seconds is just to enable pairing it with other BT devices. BT on your phone is always 'on', in receiving mode, i.e. barely measurable battery consumption (in a lab situation), polling for (previously) paired devices to announce their 30 feet vicinity (a leisurely distance I've yet to experience IRL, BTW).
And it
I'm thinking the issue is with your head unit.
Any time I step in the car, my phone gets connected within a few seconds, while it remains in my pocket. If I had the BT off wile driving, then the only thing I have to do is to pick up the phone and switch the BT ON (from the pull-down menu in the notification bar, Android v2.3).
Using a Parrot bluetooth carkit with HTC Desire.
The fact that it worked previousely with Nokia phones, still doesn't mean that it should automatically support HTC Android phones.my head unit is the pioneer 9800bt. prior to the htc i was a nokia junkie. this bluetooth thing was never an issue ans it would be an always visible connection. now i have to go through several clicks to get the head unit to connect to the phone.

I believe that there is a difference between "BT on" and "BT visibility".
So like you mentioned above, my bluetooth always connects to my car each time I get in because it was made discoverable when I first set it up. My phone is now showing it's not discoverable. So your saying that I am safe to keep bluetooth on and keep it as discoverable off. So this is correct and safe way to go right?
IMO the problem is your headunit.
Discovery is for helping devices find each other and pair.
Once they are paired, they "know" about each other and no longer need to discover each other.