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You can rent TV Shows from the iTunes Store and watch them on your Mac or Windows computer, iPhone, or iPod touch.1

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.

If you have issues with your iPhone, try these tips first.

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

When using iOS 4 or later, the Nike+ application does not offer an option for a calibration workout. Instead, you can calibrate at the end of any workout.

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

Immediately after updating to iOS 4.0, some users may notice that Exchange ActiveSync Mail, Contacts, or Calendars do not sync, or sync very slowly. In addition, some Exchange Server administrators may notice their servers running slowly.

When I play music or listen to a call through the speaker phone, the sound may appear low or muffled, or the person I’m talking to claims that I sound muffled or not loud enough. 

You may encounter the following issues:

You are unable to receive MMS messages
You do not see the camera icon next to the message field:

A red exclamation mark appears next to MMS messages you send:

Note: MMS is not available for original iPhone

When someone calls, I can’t hear them through the receiver or speaker phone, and I can’t hear music through the speaker. I also can’t be heard by someone who is calling me.
Note: iPhone has one speaker, which is adjacent to the dock connector. On iPhone 4, the speaker is to the right of the dock connector. On earlier iPhone models, the speaker is to the left of the dock connector.