Side kick lx 2009 whats wrong with it?

About 3-4 days ago me and my fiance were eating breakfast and i dropped the phone.. OOPSY :( well later that day we noticed our service/signal thing kept blinking and kept saying searching. Now it shuts its self off and on about 20 times a day. We got the phone from a friend and lord knows how many times its been thrown and dropped. But even before it's never phased it. Should we call T-mobile and ask them? or just wait and see if it fixes it self...whats going on here?