Apple seeds iOS 10.2.1 beta 4 to developers and public testers
Just days after Apple seeded a third beta version of iOS 10.2.1 to developers, the company on Thursday issued a fourth iteration of the forthcoming operating system for testing.

The latest iOS 10.2.1 beta release, identified as 14D27, arrives just three days after Apple seeded build 14D23 to developers and mere hours after the fourth beta of macOS hit distribution servers.
While specific changes are left unmentioned in today's release notes, the timing and build number suggests only minor bug fixes and improvements are included in the new software.
Apple appears to have returned to its usual beta software release schedule following a holiday break, issuing a third iOS 10.2.1 beta alongside new beta builds for macOS, tvOS, and watchOS on Monday. The company seeded initial beta builds in in mid-December which were followed by second versions on Dec. 20.
Developers who have not already provisioned their iPhone or iPad to receive over-the-air updates can download iOS 10.2.1 through Apple's developer portal. Apple ID owners who enrolled their device to test Apple betas can download today's seed via Apple's Beta Software Program website.

The latest iOS 10.2.1 beta release, identified as 14D27, arrives just three days after Apple seeded build 14D23 to developers and mere hours after the fourth beta of macOS hit distribution servers.
While specific changes are left unmentioned in today's release notes, the timing and build number suggests only minor bug fixes and improvements are included in the new software.
Apple appears to have returned to its usual beta software release schedule following a holiday break, issuing a third iOS 10.2.1 beta alongside new beta builds for macOS, tvOS, and watchOS on Monday. The company seeded initial beta builds in in mid-December which were followed by second versions on Dec. 20.
Developers who have not already provisioned their iPhone or iPad to receive over-the-air updates can download iOS 10.2.1 through Apple's developer portal. Apple ID owners who enrolled their device to test Apple betas can download today's seed via Apple's Beta Software Program website.
Comments
Yesterdays update pb3 solved much of the lagginess that I'd been experiencing in the camera and safari.
I can still see the pixels before they are smoothed out though.
Li-Ion batteries don't have the internal gassing that Ni-Cads do, so there's no memory effect and no need to run them down. I think Apple may have changed there policy on running the batteries down to 0, as I don't see that advice anymore.
I used to do it every six months or so, but stopped. It didn't seem to affect anything, and it just ups the charge cycle count faster.