I'm a low-tech kind of guy and while I carry an i-phone and use it I use virtually none of the applications, haven't bother yet to sync it with my vehicle phone capabilities, etc.
I did google the subject("bluetooth phones noisy background") and it appears your plight is a common one.
These are all retail listings that I will paste below but as you can see the feedback and background noise issue is mentioned in almost all of them.
I think your friend might need a newer model bluetooth or perhaps some noise-suppression ad-ons.
Good luck!
Samsung HM1700 Bluetooth Headset with Noise reduction and Echo ... This feature is indispensible for users who carry both a business phone and a personal ...
Bluetooth Wireless Headset with Echo-Cancellation and Noise Reduction for HTC Phones with Free Car, +, GTMax Windshield Car Mount Holder with Large ...
Samsung HM1900 Bluetooth Headset with Noise reduction, Echo
Amazon.com: Samsung HM1900 Bluetooth Headset with Noise reduction, Echo cancellation and supports Music streaming (Khaki): Cell Phones & Accessories.
Apr 6, 2007 - These snazzy new headsets feature noise-canceling technology that lets you hold a quiet conversation without having to look for a phone
Thank you, Fightin Whitey. You used smarter google search parameters than I. It’s comforting to know it isn’t just me, and the problem is experienced by others. I will use the information you discovered and check the comments and noise-suppresion add-ons. Thanks, again!