HTC is actually bringing back Sidetone as an option:<p><a href="http:&#x2F;&#x2F;blog.htc.com&#x2F;2015&#x2F;09&#x2F;re-instating-the-sidetone-option&#x2F;" rel="nofollow">http:&#x2F;&#x2F;blog.htc.com&#x2F;2015&#x2F;09&#x2F;re-instating-the-sidetone-option...</a>