Hello all, thanks in advance for any help !

I jailbroke my iPhone 4 a few weeks ago using jailbreakme.com and all was working fine until I either added or deleted a jailbroken application or fix that caused the iPhone's main phone application to put me on mute every phone call I receive or place (such that the person on the other end can't hear me). I've since uninstalled all my jailbreak apps and fixes, without success

Any ideas as to how I might fix this ? I can't restore and rejailbreak because I'm an idiot and didn't back up the SHSH blobs for this phone, only my former iPhone 3GS. (Great load of good that does me.)

Heeeeelp ! If i can't fix this soon I'm going to have to restore the phone and lose my jailbreak... ;(