Thread: iOS 4 - impressions, tips, etc...

iOS 4 is now available for download and install via iTunes for Legacy devices (iPhone 3GS and iPhone 3G -- not available for first gen iPhone).

worth reiterating:

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Please note -- that if your iPhone is jailbroken to provide a carrier unlock, applying this update will lock it again, and remove the jailbreak. If you depend on a jailbreak for an unlock, DO NOT UPDATE.
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Good review of iOS4 from Dan Moren:

Apple iOS 4 Smartphone Review | Macworld

While formal benchmarking is tricky on the iPhone, my initial impression of iOS 4 on my iPhone 3GS is that it’s quite snappy — more so than version 3.1.3. The OS as a whole seems more responsive, but there are a couple of places where speed improvements are pronounced: in general, the Camera app running on an iPhone 3GS seems far zippier now than previously. Pictures get taken almost instantaneously, and I didn’t notice any of the sluggishness that has occasionally plagued iPhone 3.0.

I’ve been running the GM release on my 3GS for weeks, and I agree. iOS 4 feels faster than 3.x on the same hardware.

Here is an excellent walk-through of iOS4, and what to expect.

iOS 4 walkthrough | TiPb

Excerpt:

iOS 4 in 10 minutes: video quick-start guide

If you don’t have time (yet) to read this massive iOS 4 walkthrough and are eager to get the basics down now, here’s a quick 10 minute video guide to get your started.
We’re showing it off on an iPhone 3GS, which should be similar to how it will work on an iPod touch G3. If you’re using the iPhone 3G or iPod touch 2G you won’t get the multitasking and wallpapers. You’ll blame Apple. Apple will blame the hardware. The hardware will try to frustrate you into upgrading to an iPhone 4. You’ve been warned.
Note: If you haven’t updated yet, save yourself some time and potential hassles and go read our getting ready for iOS 4 post first first. Then once you’re good to go, sit back, relax, and hit play on the video below.