The Apple website provides messaging, hardware, start up and wireless network troubleshooting information for the iPhone. The information is available on the Support section of the website.
The Apple website provides a series of steps that users need to follow when iMessage and group messaging are not working. The site also provides a list of tasks that users should carry out when they are unable to send and receive messages or are seeing an email address instead of the phone number when sending messages.
Apple also provides assistance with hardware problems for features such as sound, buttons, microphones and cellular connectivity. Sound problems outlined on the website include microphone and receiver issues as well as the absence of sound in the speakers and stereo headset. Users also learn how to keep the iPhone and other mobile devices within acceptable temperatures and resolve the "No SIM installed" alert through the site's Support page.
The website offers the series of steps required to restart an iPhone that has a frozen screen. The site also teaches how to resolve issues that involve connecting to a wireless network and outlines how to check the router configuration, turn the wireless network on, and check wireless cables and connections.