The reason I'm saying this is when I had the Bionic, I used a way to "reacquaint" the phone to 4G. It entails powering down the phone, removing the sim card and powering up again (ignore the warning that a sim card isn't inserted). Then power down, reinsert the card and power up. Well, I reinserted the card in backwards and fried it. The phone worked fine, but no 4G. I took it to a Verizon store and told them what I did. They confirmed the sim card was fried and swapped one out for free.