I just wanted to update this thread. I have started posting over in the AT&T forums but I had an interesting development today. Below is what I posted over there:
Just as an FYI, I just received my Spigen Slim Armor. I love the case but it will not allow PMA wireless charging. I have the coil in my OEM backplate and it charges fine without the case, fine with just the TPU portion of the case but when adding the hardcover layer, it will not charge. If you are doing this mod, it looks like we will need to stick with TPU cases and nothing with a thicker cover. I also tested my Spigen slim snap on case just like the one above and it will charge but its very finicky on placement. I have noticed that the charger does not activate unless it has the magnetic pull. This makes me wonder if a Qi coil would work for PMA if you used the magnetic disc to activate it. I am pretty happy with my setup now but maybe someone out there will want to try this.
I really think this magnetic disc may be a key to getting our phones to work with a Qi coil. I am not suggesting our phones will work with a Qi charger but just use the Qi coil to charge via PMA if you have a magnetic disc to activate it. By testing the 2 cases above, The Slim Armor will not work and I cannot feel any magnetic pull when placing it down on the pad. When I take off the hardcover, I can feel the magnet and it works. The Spigen Slim case is a hardcover as well and it reduces the magnetic pull a bunch. If I slide it off the center even slightly the charging pad will immediately quit charging. This tells me that the magnet is the key. Now I wish I had not sent the Qi charging back to the eBay seller and could try this with a magnet.
I saw in the wireless sticker thread where someone had ordered a 5 pack of these sticker and was selling them. I missed out on his deal but if anyone else decides to order the 5 pack, I will purchase one to try this mod. I am not going to do it now as I am happy with my current situation but I am willing to test if no one else decides to.