You're right - I was mistaken (and will update my comment); the iPhone doesn't support aptX. Admittedly, I use the headphones more often with my MBP, but I have

You're right - I was mistaken (and will update my comment); the iPhone doesn't support aptX. Admittedly, I use the headphones more often with my MBP, but I haven't noticed any quality degradation when using my phone (as long as the source is a higher bitrate/quality).