Its very frustrating having signal issues. I would be glad to look into this for you. Are you still experiencing a issue? Have you tried removing the battery and retesting? There is no known issues in the LA area. When did this start happening? Was it after a particular application was downloaded? If so please remove the app and retest. Please place your device in safe mode and see if its a application that is causing your issue. Does this only effect your device or others as well? Please repost if you are still experiencing issues.
Is it still out?
My new Samsung Charge not connecting and saying i dont have a SIM card installed. Replaced it at store today but 5 minutes later (while driving backt to office) the error message came up again. Not able to make calls either.