I've had this problem for a while now but I've become fed of up with it. Whenever I'm in a call (whether it be incoming or outgoing) the voice or sound coming from the ear piece crackles or distorts during calls. This also occurs when I plug in the head phones so I know that it isn't the ear piece thats broken. I just formatted or reinstalled everything but it still has that problem. It's on 2.2.1 and jailbroken. I did some googling and I found that some people with this problem said that it could be because they are using the old Rogers SIM cards and that switching to the new SIM cards will fix this issue. I am using a old Rogers SIM card and do have one of those new ones but I was saving it as backup. I am willing to change it if it means that it will fix my problem. Can anyone confirm? Or could it be hardware problem or possible too many apps running in the background which then lags the phone?