Apple - Support - Most Recent - iPhone

1. iPhone 4S displays 'No Service' or 'No SIM Card Installed'
   In certain situations, iPhone 4S may have difficulty recognizing a micro-SIM card, resulting in the following behaviors: "Invalid SIM" or "No SIM Card installed" alert appears intermittently. Status bar displays "No Service" or "Searching" in a location with good network coverage.
2. iOS 5: List of available trusted root certificates
   These trusted root certificates are preinstalled with iOS 5. When IT administrators create Configuration Profiles for iPhone, iPad,  or iPod touch using the iPhone Configuration Utility, these certificates do not need to be included.
3. How to clean Apple products
   Read recommendations and guidelines for cleaning your Apple computer, iPad, iPhone, iPod, display, or peripheral device. 
4. iPhone or iPod touch: What to do if you are unable to set the time zone
   You may be unable to set the time zone on your iPhone or iPod touch.
5. Setting up and troubleshooting AirPlay Mirroring
   Learn how to set up AirPlay Mirroring, and how to troubleshoot AirPlay Mirroring issues that may occur between your iPhone, iPad and Apple TV (2nd generation).
6. About the security content of iOS 5 Software Update
   This document describes the security content of iOS 5 Software Update, 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".
7. About the security content of iOS 5.0.1 Software Update
   This document describes the security content of iOS 5.0.1, 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".
8. iOS 5: Font list
   Learn which fonts are used in iOS 5.
9. Using AirPlay
   With AirPlay, you can wirelessly stream videos, music, and photos from your iPhone, iPad, or iPod touch to Apple TV (2nd generation) and stream music to AirPlay speakers or receivers, including AirPort Express. You can also wirelessly stream videos and music from your computer to Apple TV (2nd generation) and stream music to AirPlay speakers or receivers, including AirPort Express.
10. iPhone and iPod: Using the iPad 10W USB Power Adapter
    iPad comes with a 10W USB Power Adapter. This article discusses using this adapter with iPhone and iPod.
11. Sprint Wireless Online Support
    Visit the links below to find the best place to go for your Sprint Wireless questions:
12. Well known TCP and UDP ports used by Apple software products
    Learn more about TCP and UDP ports used by Apple products, such as Mac OS X, Mac OS X Server, AppleShare IP, Network Assistant, Apple Remote Desktop, Macintosh Manager, and MobileMe. Many of these are referred to as "well known" industry standard ports.
13. Lion Server: Push Notification Server and supported applications
    The Push Notification service in Lion Server supports sending Push Notifications to Mac OS X and iOS client applications. Additionally, the service can be configured to provide Push Notifications to third-party applications which use the ServerNotification framework.
14. Sprint: Unable to use phone number for FaceTime or iMessage when using Google Voice
    If your Sprint account is integrated with Google Voice, you may be unable to use your phone number to receive FaceTime calls or iMessages.