After getting update 7.0, Nexus 6 users had to wait quite a bit for Android 7.1.1 while other nexus devices like the 6p and 5x got it much earlier. However, when the update finally arrived it came with a bug. A major bug.
As reported by most users on Google forums and AOSP tracker, that updated their devices, the speakerphone is making an echoed sound on the other persons device during a phone call. This means this is most likely a bug of the microphone of the Nexus 6. It’s a weird hizzy and unpleasant noise.
The issue goes away on flashing some other stable ROM but returns back on installing official Android 7.1.1 update. Fortunately, Google dev team knows about the issue and is working on fix (Issue Tracker, response #19). Let’s hope for a quick fix.
We will keep you updated if we find any other issue with the Nexus 6 running on Android 7.1.1 and also if the Google Developer Team finds a way out to fix this issue! Till then, all we can do is wait and relax and subscribe to Tekh Decided! Cheers!