The new OS installed fine (apparently). However, I can't dial any phone numbers, check recent call info, or use the dialer at all. When I bring up the dialer it is totally unresponsive to inputs. After about 5 seconds the entire screen goes black. After another 5 seconds an info box pops up that says "Unfortunately Contacts has stopped.". When I click through this message I am returned to the normal home screen. Everything else seems to work OK. How do I get past this issue without wiping out my phone?