Hi all, I received my AirPods yesterday. I tested them out on my iPhone 6s (on AT&T), the sound quality is great while listening to music. However, when using them on phone calls, there seems to be some noticeable static in the background. Certainly nothing that makes them unusable, but the faint static/hiss is definitely there. Again, this only happen on phone calls. On music, they sound crystal clear. Has anyone else noticed this? I'm just wondering if this is just the nature of calls over Bluetooth, or if there is an issue with my AirPods. Thanks!