According to the release notes, iOS 4.0.1 includes the following bug fix and improvements:
Please note that iOS 4.0.1 won’t fix the reception problem, it will show the signal strength correctly.
Let me explain. Here are some key points from Apple 's
Upon investigation, we were stunned to find that the formula we use to calculate how many bars of signal strength to display is totally wrong. Our formula, in many instances, mistakenly displays (more…)

to confirm that they’re incorrectly displaying the signal strength, which will be fixed with a
that will provide users a much better indication of the reception that they are getting in a given area.
Upon investigation, we were stunned to find that the formula we use to calculate how many bars of signal strength to display is totally wrong. Our formula, in many instances, mistakenly displays 2 more bars than it should for a given signal strength. (more…)

Dear iPhone 4 Users,
The iPhone 4 has been the most successful product launch in Apple ’s history. It has been judged by reviewers around the world to be the best smartphone ever, and users have told us that they love it. So we were surprised when we read reports of reception problems, and we immediately began investigating them. Here is what we have learned.
To start with, gripping almost any mobile phone in certain ways will reduce its reception (more…)

“Syncing is horribly implemented. There's no feature to manually select which contacts/friends you would like synced. The app itself automatically chooses which facebook user, not friend, is synced to each contact in your iPhone contact list. The reason I say “facebook user” and not “facebook friend” is because it will sync random facebook users to iPhone contacts with the same name; even if you aren't friends with said random facebook user. (more…)

According to a post by an iPhone user on the MacRumors forum, the problem has been observed irrespective of the iPhones being
or otherwise. AT&T and Apple have so far denied any widespread occurrence of the issue and claim they are isolated incidents. However, according to a poll conducted on the Engadget blog, close to 69% of the iPhone users who tried sending an MMS have apparently faced this problem.
, which seemed to have gone off smoothly (more…)