I recently bought an off-contract 4s that is locked to AT&T. I verified it via the imei number. I submitted an unlock request via ATT's website, and for the past couple of days, it was in "pending" status. So yesterday, I decided to pop in a T-Mobile sim to see if it would recognize, and to my surprise it did. I got the "activation required" notification, and activating it via wi-fi. Just today, I received a message from ATT saying the unlock was denied, but it was NOT for the contract issue, it was for another problem. However, my iphone can still recognize the t-mobile sim, and upon verifying it again with IMEI, the status was still "locked" What exactly does this mean?