With my new Lifeproof NUUD case I made 3 calls and received 4 calls. On all calls to and from, my voice on other end all sounded muffled to them. I could hear them very good, no distortion off any kind. They said it was hard for them to hear me but they did hear me. They also told me they did not have any trouble with calls from other people, It's not my "speaker" on my phone causing the muffled sound on their end, it was my mic on my phone that wasn't letting my voice out clear to them without the muffled sound. I did try and blow with a sudden burst into the mic. I'm just wondering, how does blowing in my speaker on my phone help my voice to them on the other end---could it just be my mic on my phone, isn't letting my voice out clear to them.