1. The hardware in this phone is not capable of true call recording, since the audio output is not routed in through the audio input. The only audio input in this phone is the microphone. So while you can certainly start a recording while on a phone call, all you will get is your own voice.
A possible workaround is to put the phone in speakerphone mode during a call, then start the recording. That may make the other caller's voice loud enough to be picked up by the microphone. Worth a shot, anyway.
2. BT headset volume is a common complaint (and car kits are basically just a glorified BT headset). Does the car kit not route through your car stereo speakers? So can you not just turn up the volume on your stereo?
Someone here posted a hack for Verizon call volume by modifying the vocoder settings in the phone (search for vocoder and you should pull up the thread). I doubt it will really help much but may be worth a shot (I'm on Sprint so I've not tested it myself).
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