I am with Boost Mobile on a HTC EVO DESIGN 4G i have replaced my DESIGN 4G 5 TIMES yup believe it or not. I had insurance and returned it within 30 days of the purchase date a few times now but this is 6th DESIGN 4G i have right now i know it has been kind of a hassle. But the DESIGN 4G is the Latest and Greatest phone available on Boost Mobile that Sprint passed along so it is a keeper and i have been happy. But i have had people tell me you sound,fuzzy i can barely here you there is echo on my end. Sometimes i can barely here who i am talking to. I am wondering if it is Boost Mobile or The Actualy phone the DESIGN 4G?????????? I had the ZTE WARP and i didn't have a problem i swear this i would bet it's the phone right? I have turned down my earpiece volume and that didn't seem to have anything to do with it. Anyone know what the problem could be maybe some setting i need to adjust? HTC IS ONE OF THE BEST MAKERS OF ANDROID PHONES I DO NOT UNDERSTAND WHAT IS WRONG. MY ZTE WARP I NEVER HAD AN ISSUE LIKE THIS I ONLY HAD ONE OF THOSE PHONES NEVER EXCHANED OR REPLACED IT. anyone else having call quality issues echoing,fuzzy,broken up, or any poor call quality issues on your or who you were talking to end????????? Keep in mind i do have a snap on plastic case i took it off and tried calling people but that did not seem to make a difference. Could it have a problem with the antenna and grip like the iphone 4 had????? I have just been in my house and around town when i have had the call quality issues. I was not inside a tunnel or anything Your help is Appreciated.