Over the past week I've been dealing with multiple HD7's. T-Mobile sent me a replacement one and I noticed a few things. The replacement one had a much better screen than my original, the colors were way more vibrant. This one didnt have the MAC address issue. Unfortunately, the refurb was not put together well (the back cover didnt fit right) so I returned it and got another one. This one (refurb) also had a great looking screen and no MAC address issues. Unfortunately, this one had a bad speaker! So i returned it. So my 3rd HD7 comes in and the screen looks like my original (kinda dull) and now the MAC address issue is back. Obviously the screen is not causing the MAC issues but maybe its a hardware version that is different between them.