iPhone 14 Pro Max post-call noises and people heard through receiver speaker

After ending a phone call/s (completely: both people hang up) you can still hear noises and sometimes people coming through the receiver speaker on the iPhone. I have checked the phone and settings to verify NO ONE is still on the phone. I physically can’t see or locate any activity or items (apps or features) using the microphone via indicator sensors. Yet there’s obviously “someone” or “something” on my phone calls simultaneously every time I engage in a phone call.

Note: FaceTime OFF in iPhone settings & iCloud, I don’t have Wearable attached or any other devices using my Apple ID , I changed eSIM prior to problem & changed password to Apple account as well as signed out of phone & signed back in & did network reset.

Can someone please provide assistance; as Apple has said “Party Line” issue “CrossTalk”. Contacted Phone Carrier asked to Reprovision device and service back to network they did CarrierUpdates and said a Tower is Degraded in my proximity; why I can’t get adequate signal Field Mode says: -114dB RSRP 10Mz Bandwidth.

Rabbithole theory: WireTapp or StingRay issue or … Someone using my Phone# on their own wearable devices w/o my knowledge

[Re-Titled by Moderator]