I have done numerous hard resets, all have same result. The phone will make a perfect call, I had 2 half hour cleat conversations , but as soon as the sprint installer starts to load and update, bam, problem is back. Every time I reset it happens. Because phone can't download when I am on a call, if I make a call right after phone comes back on, its clear, like a different phone. Once that installer is done, I make a call, and static. I wish I could stop it from starting but I can't. As far as you saying its not happening on any other devices, go on this forum for Verizon version and there are over 50 complaints. Sprint CSR are useless, I went to corporate store no less, my 4 year old has more knowledge than they do. Lg told me to send phone to them, unfortunately I can't be without a phone for two weeks or so, this is a business line and I sold my HTC one for this $500 paperweight. It has nothing to do with a speaker, it only happens during calls, not video or audio playback. Speakerphone or earpiece, same issue.