Google started updating its branded devices to latest Android Nougat back in December. Google Pixel and Nexus devices were the first lucky devices. Or that's what owners of Nexus 6 thought. Luck isn't exactly the word to use for the last week or two. Google Forums got flooded with tens of messages about faulty speakerphone. According to users, when on a speakerphone call, the other person will hear an echo, squealing and other weird noises. One of the owners suggested to Mute your mic when on a phonecall, but is this really the solution? Browsing through the Issue Tracker of...
Source: http://www.gsmarena.com/nexus_6_owners_suffering_a_speakerphone_problem_after_update_to_nougat_711-news-22684.php