I was on a call and all of the sudden, I dropped the call. No big deal, but then I lost service in my house for 5 mins. I make calls from here all the time. So, I shut the phone off and turned it back on and all my contacts are gone!!!!! I shut it off and turned it back on and they didn't come back. There are hundreds of contacts and most are linked to facebook, one on one of course. How do I get them back!?