My T didn't spike but it gave me quite a scare. This is why I only use speakerphone. After my accident, I was afraid to put a phone to my ear. And now I know that my decision was the right one. You never know when someone's bluetooth or whatever will emit high-pitched feedback. It's bad enough coming from a speakerphone. I wouldn't want it directly in my bad ear (or in my good ear, which I want to stay my good ear).
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