iOS 4.0 has rendered my iPhone virtually unusable ...
Hello again! Thanks for advice last time - it worked! I've downloaded iOS 4.0 onto my phone but now my touch sensitivity has gone down. For instance, I'm tying this message on my iPhone and I've had to press several keys multiple times because they went unregistered on the phone. It also freezes up on the unlock screen and won't let me slide to unlock it.
This has been a problem since the software came out - and while I know it hasn't been long it's a nuisance! Should I take it into the "genius" bar or do you know what the problem could be. The screen is clean as well if that has any relation.
Thanks for your help in advance!
I have experienced slow performance like you described on my wife's iPhone 3G. I did not have any problems with the 3GS I had been using. Many iPhone 3G users have had problems with the IOS 4.0 update bogging down the phone, and I could imagine that some 3GS iPhones could have similar problems.
From what I have read - and found through testing - you can fix these issues by erasing the iPhone and restoring it to factory defaults. Instead of restoring from your backup, you set it up as a new iPhone. It will take some time to get all the settings back to what you are used to, but in many cases this will fix the problem. If it does not fix your performance, you could format again and then restore from the backup.
I hope this helps, let me know how it works for you.