My LG Optimus has been working great and fully functional. However, the problem is with the SIM card icon that appears on the lock screen. Now I was thinking that if I have a problem with my SIM card, the phone wouldn't function but I'm able to make calls, text and use data with no problems. Straight talk has no idea what's going on. One LG support I saw said to remove the battery for a minute but that doesn't work with a hard reset. Does anyone have any suggestions. Should I root the phone?