I have a solid number on my Coverage Unit and bars on my Network Unit, but nothing on my mobile device!
Once a mobile device has repeatedly found a signal it can tend to remember this signal and not look for a new signal. Restarting the phone can often force the phone to look for a new signal.
Go to the location of your Coverage Unit and simply power off and back on your phone. You might have to do this 2-3 times for the phone to recognize the new signal.
**Network Unit (NU) is also known as the Window Unit (WU).**