I have been having some trouble with the sound on my HTC EVO 3D. Recently I noticed that even with the Volume pulled all the way up, the phone's exterior speaker doesn't make any noise at all. This includes the clicking sound from my Swype keyboard, the Music app, everything. The only time I seem to hear sound is during a phone call, but only in regular non-speakerphone mode. I tried switching to speakerphone during one of my conversations, and it essentially just muted the person's voice. I rebooted my phone a few times, and I noticed the sound DID come back, but only temporarily as the phone muted again within minutes. I thought it might be a hardware problem, until I noticed that when I have my phone plugged in to charge the sound works fine. Then when I unplug, the problem returns. Does anyone know of any way to fix this, or will I have to bring my phone in to get checked out? Really hoping this is just a small software bug... Any input would be greatly appreciated. Thanks!