I'd like to unlock my LG Thrill to use on a different GSM network. I've tried doing it without a SIM card, no luck, said "emergency calls only". Got a SIM card from a Straight Talk phone (non smartphone SIM card) tried, still no luck. Got the message "network unlock unsuccessful". Question is, what am I doing wrong? I have the unlock code from at&t and a working Straight Talk SIM card. Please help! Now the Straight Talk SIM card I was using isn't even recognized by my phone. Wow, 140+ views and no replies?