I am on my 2nd 8800. My problem is the same in that I cannot hear incoming callers and they can't hear me. This is a sporadic problem but lasts for days at a time. I just received a replacement phone a week ago and yesterday the problems started again. I haven't tried the speakerphone trick but I will do that the next time someone calls. I'd hate to get a whole different phone because this one apparently has some flaw.