If you are in an area with your device where you have poor service then it may be useful to download the video to your device rather than trying to stream the video. If your phone supports the ability to download video then a "Download" button will appear below the "Play" button on the video detail page. Click the button and your device will ask you where you would like to save the video on your phone.

Note: On an iPhone the "Download" button will not save the video to your device, but it can be useful if you are in an area that does not have a strong enough signal to support streaming video.