It looks like Google has given its Googlebot crawler a brand new iPhone. If you track Googlebot visits to your site, or emulate one to “view as Googlebot” for testing purposes, you should be aware that Googlebot has a new iPhone user-agent to reflect the iOS 8 from iOS 6 difference.
The new iPhone Googlebot is:
Mozilla/5.0 (iPhone; CPU iPhone OS 8_3 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12F70 Safari/600.1.4 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
This replaces the old one:
Mozilla/5.0 (iPhone; CPU iPhone OS 6_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/6.0 Mobile/10A5376e Safari/8536.25 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
Google has already updated their user-agent blog post with the changes and the remaining support documents in the Google Search Console help files will be updated soon.
