Hi Listeningtrees,
Thanks for contacting Apple Support Communities!
We understand that the audio from your iPhone isn't correct after taking or making calls.
Do you happen to use a Bluetooth device with your iPhone to listen to audio? We ask because the behavior you're describing sound like wireless interference: Resolve Wi-Fi and Bluetooth issues caused by wireless interference - Apple Support
Symptoms of wireless interference
Any of these symptoms could be caused by interference affecting the Wi-Fi or Bluetooth signal:
• Device doesn't connect or stay connected
• Connection is slow and signal strength is low
• Bluetooth audio skips, stutters, cuts off, or has static or buzzing
• Pointer movement is erratic or jumpy
How to reduce wireless interference
These general steps can help achieve a cleaner, stronger wireless signal:
• Bring your Wi-Fi device closer to your Wi-Fi router. Bring the Bluetooth devices that are connecting to each other closer together.
• Avoid using your wireless devices near common sources of interference, such as power cables, microwave ovens, fluorescent lights, wireless video cameras, and cordless phones.
• Reduce the number of active devices that use the same wireless frequency band. Both Bluetooth and Wi-Fi devices use the 2.4 GHz band, but many Wi-Fi devices can use the 5 GHz band instead. If your Wi-Fi router supports both bands, it might help to connect more of your Wi-Fi devices to the 5GHz band. Some dual-band routers manage this for you automatically.
• Configure your Wi-Fi router to use a different Wi-Fi channel, or have it scan for the channel with the least interference. Most routers perform this scan automatically on startup or when reset.
Does this apply to the behavior you're noticing?
We look forward to your reply.
Cheers!