Welcome to the Community!
We were able to locate your account using your community details and learned that this case us handled by our Engineering team.
We note that using your 8 yr old handset, you weren't able to hear any noise, but as soon as you use your current handset, the noise is evident. We understand that you'll buy or use a newer phone to test it again and your assigned Engineer will be waiting for the result.
Further updates will be given once available.