Editing Explicit Congestion Notification (section)

====iOS====
In June 2015, [[Apple Inc.]] announced that [[iOS 9]], its next version of iOS, would support ECN and have it turned on by default.<ref name="apple-wwdc-719" /> TCP ECN negotiation is enabled on 5% of randomly selected connections over Wi-Fi / Ethernet in iOS 9 and 50% of randomly selected connections over Wi-Fi / Ethernet and a few cellular carriers in [[iOS 10]]<ref>{{cite web|url=https://developer.apple.com/videos/play/wwdc2016/714/|title=Networking for the Modern Internet - WWDC 2016 - Videos - Apple Developer|first=Apple|last=Inc.|website=Apple Developer|access-date=18 April 2018|url-status=live|archive-url=https://web.archive.org/web/20180418161153/https://developer.apple.com/videos/play/wwdc2016/714/|archive-date=18 April 2018}}</ref><ref>{{cite web |url=https://www.ietf.org/proceedings/98/slides/slides-98-maprg-tcp-ecn-experience-with-enabling-ecn-on-the-internet-padma-bhooma-00.pdf |title=TCP ECN — Experience with enabling ECN on the Internet |first=Padma|last=Bhooma |date=March 2017 |access-date=2017-05-03 |url-status=live |archive-url=https://web.archive.org/web/20180509153808/https://www.ietf.org/proceedings/98/slides/slides-98-maprg-tcp-ecn-experience-with-enabling-ecn-on-the-internet-padma-bhooma-00.pdf |archive-date=2018-05-09 }}</ref> and 100% for [[iOS 11]]<ref>{{cite web|url=https://developer.apple.com/videos/play/wwdc2017/707/|title=Advances in Networking, Part 1 - WWDC 2017 - Videos - Apple Developer|first=Apple|last=Inc.|website=Apple Developer|access-date=18 April 2018|url-status=live|archive-url=https://web.archive.org/web/20180131043815/https://developer.apple.com/videos/play/wwdc2017/707/|archive-date=31 January 2018}}</ref>