When a missed call is encoutered. The phone hub updates the missed call number. but on clicking the phone hub, i'm taken to the Phone window and not the call history window. because of this the number in the hub doesn't go back to 0 and only keeps on increasing with each missed call.
I linked the phone icon to the "calls.exe" from PhonEx and found the number reset to 0 after I closed the calls application. Tested for missed calls and it seems okay. Not pitching PhonEx here, just found the built in dialer and contact list less than thumb friendly. A* would have to confirm but it seems sensible that zeroing out the counter would be part of the "if tile pressed" code in his application.