I've started this thread to collect information and experiences from those that have the original iPhone 4 and have upgraded to IOS 5.
This thread was prompted by a very frustrating call yesterday to AppleCare. I own an iPhone 4, and asked the simple question: "If I upgrade to IOS 5, will my phone operate at least as well as it did with IOS 4, or will there be speed and compatibility issues?" Apple did a very flashy tap-dance all around the answer, never giving me a "yes it will be fine" "it will be better" or "it won't be as fast". Nothing of the kind! Their answer got down to a dodge: "if you have problems, we will work with you", and "check Google to find out if there are problems". The first answer is exactly the situation I had with my old iPhone 3 (see below)! "We will work with you" means "upgrade at your own risk, if the phone performance is poor, but there are no hardware issues, you're stuck with it". And the second "check Google" answer was the creator and manufacturer directing me to an unknown third party, without accountability, for information. As if Apple doesn't know, or hasn't tested for full iPhone 4 compatibility. Right.
Previous experiences by owners of less-than-current iPhones that upgrade to a new and flashy OS haven't been great. My example is I had an iPhone 3 running OS 2. When OS 3 showed up, I upgraded almost immediately, not realizing how bad an idea that was. The phone did operate, but became very sluggish and unresponsive, basically, a real frustration. Of course, no way to back up to OS 2, it was a one-way street. No, a full restore or reset did NOT revert the OS. Apple's position on support was that there was nothing wrong with the hardware, so they offered no fix. It took almost a year of updates before the phone's speed improved, but never returned to what it was with it's original OS.
Why Upgrade to IOS 5?
Owners of previous generation products have always had this problem: do I upgrade or not? Will I get better performance, or will this be a side-grade, or back-grade? The reality is, as much as we'd all like the latest and greatest features (as many of them as we can get with our hardware, at least), we shouldn't have to pay an unknown performance penalty. Apple always presents the latest software upgrades to us when we sync, but taking it immediately, though logical, hasn't always worked out well.
So, until Apple presents consistently fully working and bug free upgrades, gives us a means to revert to a previous, working OS environment, or provides a support option for "permanent software damage" caused by an OS upgrade, alll we can do is share information.
So, does OS 5 work on an origina iPhone 4? What issues have you had, and have they been resolved?