Apple continues weekly update cycle with iOS 11.0.2, containing iPhone 8 call crackling fi...
Two weeks since the original release, and one week after the last minor update, Apple has released iOS 11.0.2 with rectification of crackling sounds during calls on the iPhone 8 and iPhone 8 Plus, and other assorted fixes.

Apple notes that in addition to the crackling sound fix, Apple has also addressed an issue that could cause some photos to be hidden, and another where attachments in S/MIME encrypted emails would not open.
Security fixes have been applied as well, but Apple has not as of yet detailed them.
The build number is 15A421. The previous build was 15A402 for the iPhone and iPad.
As with previous revisions, iOS 11 is compatible with the iPhone 5s and newer, the iPad 2 and up, the iPad Air and newer, and all iPad Pros. It is also compatible with the sixth-generation iPod touch.
The update on an iPhone SE is 276.9MB in size. On a first generation iPad Pro it is 297.1MB.

Apple notes that in addition to the crackling sound fix, Apple has also addressed an issue that could cause some photos to be hidden, and another where attachments in S/MIME encrypted emails would not open.
Security fixes have been applied as well, but Apple has not as of yet detailed them.
The build number is 15A421. The previous build was 15A402 for the iPhone and iPad.
As with previous revisions, iOS 11 is compatible with the iPhone 5s and newer, the iPad 2 and up, the iPad Air and newer, and all iPad Pros. It is also compatible with the sixth-generation iPod touch.
The update on an iPhone SE is 276.9MB in size. On a first generation iPad Pro it is 297.1MB.

Comments
277.1MB on an over the air update for an iPhone 6S.
I’ve been very happy with iOS11, I think it’s actually made my 6S a little faster.
Installing 11.0.2 as I compose and post.
On my 6 and on a friend’s 6s there are a plethora of screen freezes, bad or super slow UI renderings in common iOS apps like Messages, battery gets drained faster than usual also after days of keeping the phone plugged in all night connected to the network to let it finish all its background work.
The camera app is very slow in updating preview of pictures taken.
My 6 sometimes grinds up to a halt. Even though initial detailed testing on Ars said that it would not be much slower than iOS 10.
And after *8* betas and one GM, already 2 big updates (almost 300MB!) in 2 weeks: what is going on at Apple??
You're getting beta. Totally different.
Basically, how versioning works is this: let's suppose there is a software with 11.3.2 version. The "2" would be an update to fix bugs without affecting backward compatibility. The "3" is usually improvements on existing issues without affecting compatibility. The "11" is a major version that can break compatibility in favor of new features. It's like this: [major].[minor].[fixes]. That's usually for production releases.
When you get developer (beta) version, it follows a different version although they increment upon fixes and features.
Is not a bug. People have complained that they didn’t like their Apple accessories, such as the AirPods, being turned off when they turned Bluetooth off in settings. They wanted it to be off when sitting somewhere listening to music, but didn’t want the danger of having someone with a Bluetooth grabber get their info off the phone. Similar thing with WiFi. It’s a security thing.
so Apple now allows you to turn Bluetooth and WiFi off in the control panel for that purpose, and turn it off completely in Settings, if you want it all off.
now, some people are unhappy about that. There is no way out of this for Apple no matter which way they do it.
Yeah, we all know this. It still doesn’t answer the question.
Ain't nothing about no promises to turn OFF WiFi in these parts, stranger...