First let me say that I've just switched to 3cx from Acrobits and so far so good. Call quality is amazing - far better than normal quality on my iphone 4s! I'm using it with a soho66 number. One thing I noticed is that when I receive an incoming call from someone in my iphone contacts list it doesn't show the person's name. Should it? And a couple of times if the phone has been inactive for a while then the phone won't ring even with the app in the taskbar. I've set it to use TCP. Anything else?