iPhone Sheep

iCal, iOS 4, and MobileMe all offer a Birthdays Calendar. This calendar is automatically generated from birthday information found in your Address Book contacts. Contacts whose first birthday is more than 77 years ago do not display when viewed in the Birthdays Calendar on an iOS Device, such as an iPhone, iPod touch, or iPad.  
The Birthdays Calendar can be synced via cable (USB) in iOS 4 or earlier versions. In iOS 4, the Birthday Calendar is available directly on the device, either from contacts stored on the iOS Device or synced with MobileMe. This issue occurs regardless of whether the Birthdays Calendar was created on the iOS Device or synced to it via MobileMe or iTunes.

After setting up an email account, you may find that Mail loads message titles but not the message body previews or that mail receives blank messages:

With preview
Without preview
Blank message

After using Nike+ on your iPhone or iPod touch, you may be unable to switch between options for repeating songs in the iPod/Music application.

This document describes the security content of iOS 4.0.2 Update for iPhone and iPod touch, which can be downloaded and installed using iTunes.
For the protection of our customers, Apple does not disclose, discuss, or confirm security issues until a full investigation has occurred and any necessary patches or releases are available. To learn more about Apple Product Security, see the Apple Product Security website.
For information about the Apple Product Security PGP Key, see "How to use the Apple Product Security PGP Key."
Where possible, CVE IDs are used to reference the vulnerabilities for further information.
To learn about other Security Updates, see "Apple Security Updates".

Occasionally, when viewing an email message written in Japanese that includes an attachment, you may not see the text of the message. The text does appear when previewing or replying to the message.

When activating 3G service on an iOS device using a custom Access Point Name (APN), the error message "Could not activate cellular data network: PDP authentication failure" may appear.

When you use iTunes to sync photos to iPhone, iPad, or iPod, iTunes creates a folder called "iPod Photo Cache" in the top level of the folder you selected for your photos. Picking another folder to sync does not erase the previous iPod Photo Cache folder. Depending on how many photos are being synced, your hard drive could fill up.

In some cases, iPhone may not show up in iTunes under Devices while displaying the following error message:

You may want to restore your iPhone, iPad, or iPod touch and set it up as new to troubleshoot an issue. Take steps to preserve your data before restoring as new by following this article.

This article discusses the compatibility of the Apple Wireless Keyboard and third-party Bluetooth keyboards with iOS devices.