I've seen this a few times but without any solutions. I'm really just wondering how common this is. I call someone and they're hearing their voice echoes back to them. It wasn't on speakerphone and it went away when I switched to headphones with a built in microphone. I assume that means their voice is leaking from my speaker to my microphone. That's incredibly annoying though, and seems like something that you'd make sure to avoid when designing a phone. I'm curious as to whether this is ubiquitous, or it's just a few unlucky people with faulty phones. Also, if someone had this issue and somehow fixed it, I'd really like to hear about that. Thanks in advance.