Wired Connection: Connect iPhone With HDMI
Your HDTV has to have an available HDMI input port.
You need to - Purchase an Apple Digital AV adapter ($30 to $40).
Plug the adapter into your 30-pin connector. Note: The newer Apple AV adapter for the iPhone 5 is called Lightning and has fewer pins.
Plug one end of an HDMI cable into the HDMI port of the AV adapter, and the other end into an available HDMI port on your TV.
Switch your TV to the appropriate HDMI input. You should be able to see your iPhone content on the big screen.
For earlier models such as the iPhone 4, the original Apple iPad, or the fourth-generation iPod Touch, the display won’t be mirrored, but it will show photos and videos in supported apps once you play them. With the Apple AV adaptor, you can charge your device while playing the content.
Wireless iPhone to TV Hookup: Connect an iPhone to an HDTV With AirPlay or DLNA
Apple developed a wireless technology called AirPlay specifically for streaming content from iOS devices.
Make sure that your iPhone is on the same wireless network as your other AirPlay devices.
On your iPhone, double-tap the Home button.
Swipe the list that appears to the right, until you get to the volume and AirPlay settings.
You can access the AirPlay settings by double-tapping Home and swiping to the right. Tap the AirPlay button to bring up a list of supported AirPlay devices on your network.
Tap the device to which you would like to stream.
A TV icon next to the device indicates that you can stream images, video, and/or audio, while a speaker icon indicates that you can stream only audio.
If you have a second-generation Apple TV ($100) and an iPhone 4S, you can select Mirroring here to mirror your device’s display to your TV wirelessly.
Open the app with the content you would like to stream, and begin playing.
You may be able to use DLNA instead of AirPlay. These days, many modern TVs support streaming from a local network (wired or wireless) via the DLNA (Digital Living Network Alliance) standard. If your TV supports DLNA (or sometimes just "UPnP") streaming, you can use your iPhone as a DLNA server. Just download and install a DLNA-server app, PLUGPLAYER ($5) for example.