While most other phones have gotten the Denim update, especially the ones on T-Mobile USA and Verizon, AT&T still has yet to do release it on the original Lumia 8 devices like the 520, 820, and most importantly my 920. Android device fragmentation is a problem Android users know all too well. Apple has the best updates. 5 year old iPhone 4S is still getting the same updates at the same time as the newest 6S.
Don't forget about us AT&T wireless.