Except it doesn't seem to dropping it like that now even with WiFi assist.
Funny I didn't mention anything at all about release notes or some sort of blind defense of anything, just discussing and questioning things that don't seem to follow, but those who seem to have a bias seem to go for those things.
Your replies are blind defense of Apple, and show that you really don't get it. I will explain with small words with a clear example. Try to keep up here.
BEFORE iOS 9:
You're home on you WiFi which has excellent coverage in the main house but only, say 40% signal coverage in the garage. You're streaming music on your iPhone over WiFi. You go into the garage. The music occasionally buffers, maybe. That's it.
AFTER iOS 9:
Same scenario. Except this time the phone more or less silently decides that your WiFi is too poor, and starts using cellular data.
Now, assume that the person in question doesn't watch every key note, doesn't read release notes top to bottom - they are just an average user using their phone like they always did.
Can you honestly say that you expect the user to clue in that simply upgrading to iOS 9 means they may be using cellular data in situations where that wasn't previously the case? We're not talking about being on WiFi, getting in your car and driving down the street and transitioning to cellular.
I repeat: We're talking about being connected to WiFi as before iOS 9, but now using cellular data in situations where that was never the case before.
Most people don't constantly look at their wireless connection info when they are places where they are normally on WiFi, because there hasn't been any reason to since 2007.
I like Apple, I really do. I'm typing this on a Mac hooked up to an Airport Extreme, and I waited until the 2016's were out to buy a car with CarPlay. But I believe in calling a spade a spade.
Apple screwed the pooch with the roll out of this feature. I believe that previous "scandals" like "antenna gate" were overblown ******** for media sites to get clicks. IMO this actually is a real problem. I called AT&T to figure out why my data went over, and I was told that they had been receiving lots of calls since iOS 9 dropped, but they were no help. I called Apple, and the rep I spoke to was no help either.
Apple should have either given users the option to enable during setup, just like they do with iCloud - depending on your settings you may get a popup during the upgrade to do something with iCloud. I received the message on both 9 and 9.1. They should have done that, or turned it off by default.
I don't pay for unlimited data because I frankly don't use enough to justify it, and I've only gone over my data once in 7 years prior to this, and that was basically planned.
I can't really understand while you feel the need to defend Apple in this case. What they did is clear. The results of that are clear - lots of people paid more to their carriers due to this feature.
Apple should have gotten in front of this issue when it blew up a few weeks ago, but Apple being Apple, they didn't acknowledge the issue and remained silent. They had the perfect opportunity to address the issue in 9.0.1, but AFAIK they didn't. So they are going to get sued. And rightfully so.