I have a BlackBerry Pearl 8220 Flip with some issues. I start it up, and I get the hourglass, and a few seconds later, the screen goes black, I get a reddish light on the front, and it restarts. Oddly enough, it only happens when my SIM card is in the phone. When the card's out, it works fine. I did a full reset on the phone from the security options section, but no luck. It booted once, but said "invalid sim card." How do I fix this?