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in car hands free for Diamond

I bought a connection for my diamond to connect to the aux input of my car stereo sort of hoping that it would work by allowing me to use the car speakers to speak & listen from phone, listening was not a problem, crystal clear but the person on the other end could not hear me. Is there an easy way to get this sorted? My stereo does not have bluetooth.

Depends on what sort of "connection" you have bought and how it works. Is it meant to be a handsfree unit, in which case it should come with its own microphone?
Or is it a USB type headset lead unit that is only meant to be used as a means of playing music via the car stereo, in which case you probably can't attach a microphone and can't use it as a handfree unit.
The way to sort it is to buy a bluetooth handsfree unit complete with microphone. These communicate with your phone using bluetooth and can either have their own amp and speaker or be wired into your car audio (usually via the phone facility in the DIN connector on the back of the car unit).
If you want to use for both phone calls and listening music it is best to get one that supports multiple Bluetooth profiles, including handsfree and A2DP.

Adapter with mic support

Hello
I have Jabra wired (not Bluetooth) headset with mic. It is very comfortable for my ears. But unfortunately it is 2.5mm, not 3.5mm. I bought 2.5->3.5 adapter off eBay and while it is fine with music, there is a problem - it does not send sound from Jabra's microphone back to HD2.
So people do not hear me at all, or hear me very bad, because basically they hear me from phone's mic, not Jabra's mic
I know that HD2 works fine, because mic works as expected with included HD2 headset.
Any suggestions ? Besides buying different 3.5mm headset or moving to BT ?

Does your headset and adapter have 4 pins?
I think you should use a 4-pin converter, cause the headset uses a additional pin to transfer the mic signal.

how would I know how many pins are there? It is rounded, do not see any pins :-(

Yes its rounded, but in 3 or 4 contacts separated.

[Q] Output audio through aux during call

Is it possible to have the phone output sound through auxiliary for phone calls if the attached aux does not have a mic. For example if I plug it into my car speakers, or if I wear headphones not made with a mic. I'm not sure if its just a problem with my phone that doesnt allow this, it shows the headphone icon yet for phone calls it still outputs through the earpiece. Calls output fine if I use a earbud that has a built in mic.
This has been an minor annoyance since I got the phone a year ago and I've been hoping after all the updates they would finally fix it.

External microphone

I want to use voice control in my car but haven't had much success using my Bluetooth visor speaker. I was thinking I might be able to wire a microphone near my face so I can use that to control things in the car.
I don't really want the headphone output connected to the car speakers (maybe sometimes) so is it possible just to connect a microphone to the headphone socket and still have the sound come from the phone's speaker?

Bluetooth question, use phone mic instead of car radio mic

Bluetooth works fine in my car as it should. However, the mic that came with the car's headunit makes me sound like a metal robot and makes it almost impossible to have a conversation. I can hear the person I'm calling just fine over my car's speakers. If I switch to speakerphone, I sound a million times better to the person as my phone is mounted on the dash, but then I can't hear them because of road noise and weakness of the phones speaker.
So my question is this. Is it possible to still use bluetooth but to be able to bypass the radio's mic to use the note's mic and have the person I'm talking to still come out of my car's speakers? I understand using an aux cable would probably work like this, but I'd rather have it work with bluetooth. as its one less thing to plug in.