Answer depends on which phone and which TV.
Let's assume you have a HDTV with HDMI port.
If it's a very new Android phone, it may have a mini-HDMI port. In that case, get the MiniHDMI to HDMI cable, and connect them both, and voila, that's it.
If it's NOT that easy, there's always the possibility of transferring the video to a computer, burn a CD or DVD with that, then play THAT instead on TV.