I Have been using the iphone7 for a about 2 weeks now & from the day started using it I have noticed lots of call quality issues : 1.) When the call is connecting a pop up beep noise from the earpiece( note it when in a quiet area,which is still fine) 2.) while speaking during a call after about 10 seconds completely the call quality changes to a different level where the person on the other side is sounds full of bass kinda. 3.)Some times our own voice echoes to ourselves which is really irritating & which I had never experienced a such thing since the iPhone 4s I think it's clear & worried that it could be a software bug or a hardware issue. any comments? Pls advise.