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Phone

Locating iPhone wireless carriers
Use this article to find links to wireless-carrier support and basic information about the services currently supported. Click the region in which you live to locate your carrier's information.
Understanding the SIM PIN
You can lock your SIM card so that it can’t be used without a Personal Identification Number (PIN). You must enter the PIN each time you turn iPhone or iPad Wi-Fi + 3G off and turn it back on ...
About SMS and MMS messaging
Learn about SMS (Short Message Service) and MMS (Multimedia Messaging Service) messaging on iPhone.
Using iPhone while in another country
Information and troubleshooting for using iPhone in other countries.

Understanding phone features
iPhone supports many phone features, including call waiting, call forwarding, and conference calls. Depending on your wireless carrier's network technology (GSM or CDMA), there are different methods ...

iPhone Discussions - Phone and Messaging
Discuss this topic with fellow iPhone users.

Calls and connection issues
Are you having trouble making or receiving a call? Can't send or receive a text message? Unable to access the Internet and aren't near an accessible Wi-Fi network? Try the following solutions.
Voicemail issues
Are you unable to access voicemail? Unsure of your password? These tips will help you resolve the most common voicemail issues.

Troubleshooting MMS
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 ...
Troubleshooting Personal Hotspot
This article outlines basic troubleshooting for Personal Hotspot, sometimes referred to as Internet tethering.

Understanding Personal Hotspot
Personal Hotspot refers to the Internet-sharing feature on iPhone 3GS or later*. This article explains how to share your Cellular Data connection using Personal Hotspot. Refer to the iPhone 4 User ...