Q: Iphone 3G slow after update to IOS4

Upgrade popped up the other day in itunes... I said OK. When done things were miserable:
1. Things were sooo slow. Repeated alarms were ringing...
2. It turned out that alarms that had been set in clock application had multiplied 10-20+fold... duplicated. There was at least a thousand of them.
I think that may have been the root of the problem as all these alarms were clogging up the system.
Took the iphone into ATT store and they say call apple and ask to be downgraded back to OS3.
Call Apple and they say no you can't downgrade and had me do a reinstall... first one didn't work.
Next day I got upgraded to a higher level apple tech and did the reinstall successfully.
Now things are decent... but haven't had time to really evaluate...

The most ridiculous issue I have noticed several times now is that when my iPhone 3GS is locked and I receive a phone call, the green slider shows up but does NOT move and it is impossible to receive the call. Very frustrating if you want to use your iPhone to receive phone calls, actually. Pressing the "home" button can unlock, but that is a ridiculous work-around for the very most basic function that the iPhone offers - doing a phone call.

BIG bug: In contrast to iPhone OS3, which I found very stable, robust and reliable, the iOS 4 "upgrade" made my 3 GS much more unreliable in general. For example, I recently lost all contacts enroute, just opening the contacts app. Quite annoying when you're out and want to call someone. It somehow rebuilt them slowly over ~1 hr (most are pushed), but this sort of renders iPhone useless for what it was originally built for (or was it?): Cell phone communication.

I also noticed that often when I unlock it (PIN code), random apps get launched. More a nuisance than a concern, but a professional OS shouldn't allow that to happen.

Finally, application launching has been somewhat slow and some apps crashed. This is getting better as developers update their apps for iOS 4, though.

All in all I make a similar experience with iOS4 as with Snow Leopard: Apple has started releasing beta versions of its OSs to the public so paying customers and not beta-testers do the testing that a reputable company should do in-house. Shame on you, Steve!

I have an iPhone 3G & am also facing the same issues conveyed by other members here for a month now. is there any solution to our problems & whether apple is looking into these support forums and working on a solution? or are we old & hence UNWANTED customers for Apple?

I am also having major slow down on my 3G since updating to 4.0. I've turned off everything and still slow in almost every app... I hope an update is coming to fix this issue.

I finally gave up on iOS 4 on my 3G and rolled it back for the same reasons. I got tired of waiting on everything. And after the install and restart of my phone the restore failed multiple times and I lost a bunch of pictures that I had not pulled off yet.

I am having the same issues with sluggishness and battery life after the update. I will try the back-up, restore, reload method mentioned earlier.

Same problems for me on my iPhone 3G:
- general sluggishness
- app crashes, especially on launch
- laggy responsiveness to touches
- skipping music if I try to do other actions while listening

Very unhappy with this performance, I won't be upgrading my wife's phone to iOS4 and really wish I hadn't. It's upsetting to me that, as more people upgrade to the iPhone 4, many of these complaints will fade away. The paranoid, conspiracy theorist half of my brain makes me wonder if this performance hit is an "incentive" to upgrade to iPhone 4.

Same ole, same ole here. My 3g is killing me. Is apple trying to make us all upgrade, by slowing us down to death.

My phone is a slug now too. How do I reset to factory settings and then restore all my apps?

When I first installed 4 I had a lot of problems and had to backup and restore again so now my backup is 4. If I go back to factory, won't it just reinstall 4 over the top when I restore all the apps?

I still have time left on my Applecare. Should I take it to an Apple Store?

I'm sure it was deliberate on Apple's part. Figuring we'll just upgrade.
Well they figured right. I'm upgrading since my contract is up..... to Droid X on Verizon.

See ya Apple and AT&T. Oh, and I'll be able to make phone calls and actually have people able to hear what I'm saying. And my phone will be able to multitask and be tethered as a mobile hot spot.

According to this, http://blogs.wsj.com/digits/2010/07/28/apple-investigates-reports-of-problems-wi th-ios4-on-iphone-3g/ Apple is working on a fix.

me too!
my iphone 3G (16Gb) is almost unusable with iOS4.

it's that slow that can take up to 5 or 6 sec to open the SMS app or the contact list..
many apps crash and often you have to touch the same point several times before it understand your input.

and last but not least, battery life....half of iPhone OS3 (and that one was already nothing special..)

hope they'r going to fix everything quickly..

I have the same exp with the 3g and i hate it i tried to downgrade back to 3.1.3 but with no luck. i really like the iphone but if this is what a 1.5 year old phone does then id rather not get the iphone 4 or even the next gen iphone 4x i might get a ipod touch but eh if my iphone cant use apps without having to hard restart then i say why try with another product that will fail and trust me i love my iphone but if apple is going to drop the ball on the ios4.0.1 upgrade to make me get a new phone well great i hear the droid is a good phone a bit dodgie but it has less issues and can multi task unlike the iphone 3g that cant even do the online stream of media with out glitching. apple if your listening you screwed up a good product and if you dont fix my phone and for god sakes hid the intenna on all future phones.

Come on Apple! Everyone with an iPhone 3G who installed the new IOS4 is having problems, me included. In only one month there are over 1,000 posts to this support discussion, over 300,000 page views, and now a Wall Street Journal article about the issue (http://tinyurl.com/2whs8vs). It's time to fix the bug for your loyal customers.

this is a particularly ridiculous "upgrade" to the iphone 3g. i could care less about getting pushed for $200 more to buy an iphone 4. i am holding out just because ATT is so bad. in the meantime, only the antenna issue gets press, but this is a horrible package for 3g owners. you get 3 features that dont change the world in exchange for an iphone thats even less reliable than before plus goes on coffee break when typing emails, browsing or using the map function (i missed 4 exits last week alone). the battery life is brutal and i struggle to get through a day even with a mophie. in fact, when talking, it drains faster than the mophie can charge it. simply, if a fully charged 3g sits 8 hours on a night stand with fetch turned off, then i make 2 hours of calls, my battery is completely drained. brutal.