When talking on the phone, one or more loudspeakers are buzzing, I can't say for sure. You can hear it both in the ringing tone and in conversation. Strangely enough, I don't hear it when playing music. Can someone tell me whether there are speakers that are only responsible for telephony, even if it is difficult for me to imagine? Or can it be something else? So far, it has occurred on all cell phones that I have tried.