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when I call my husband to his Iphone 5S from mine I hear a buzzing noise once in a while only when I call his phone and he doesn’t hear it what could it be

If it’s only when you call your husband then it will be a problem with his phone rather than yours. Possible that his microphone is faulty

@traciti , If you only get the buzzing when calling your husbands phone, it could possibly be the environment he is in (try calling him when he is out of the car/work/etc.), say maybe in the drive way and see if you hear buzzing. Maybe also try another phone and call husbands phone to see if static/buzzing. If you are still hearing the buzzing could be a hardware issue in his phone and may need serviced. If still under warranty return the device for refund/ exchange/ repair. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.