So, I have a Verizon Motorola Droid 4 that has the correct bands for AT&T but I can't get it work. I've played with the APN's and got as far as getting "SIM card is from an unknown source". After much Googling I've determined that, even though it's SIM unlocked and the bands should be OK, Verizon has blocked usage on US GSM networks. (Phone is not rooted, nor will it be ) I had hoped to be able to use my current Verizon phones on AT&T with the new reduced family rates. I picked up a SIM and only got this far. Is there a way around this or am I sunk? I'm going to borrow a different phone just to make sure I get good service at my house, but that is neither here nor there right now.