An HDMI cable can be used to stream from an iPhone to a TV. This method also works with other media devices, such as tablets.
The easiest way to connect a device to the TV is to use Apple's Digital AV Adapter, which is a cable that attaches the Apple device to the TV's HDMI port. A standard HDMI cable will also be needed. Any one will do, so the least expensive is the way to go. There are two models of the Digital AV Adapter, one if for lightning devices and the other for older 30-pin devices, make sure the right one is acquired.