Works fine , except for the annoying screech when you disconnect

When you have the sound volume on high and hang up, you get a very loud screech

The party you were speaking to will hear a loud screech IN THEIR EAR, if they hadn't removed their phone from their ear at the same time you hung up

This absurd phone was manufactured such that the speaker and microphone "interact" when you hang the phone up, and it makes a loud-pitched screech which you can hear while hanging it up