Take one minute of video. Look at the file size. Now how many of these 1 minute files can you fit onto an 8GB card in your particular format and camera/device.
SMS stands for Short Message Service, which is the formal name for text messaging. It's a way to send short, text-only messages from one phone to another. These messages are usually sent over a cellular data network. That's not always true, though, as in the case of iMessage below.
Plain text, unformatted text; Text file, a type of computer file opened by most text software; Text string, a sequence of characters manipulated by software; Text message, a short electronic message designed for communication between mobile phone users. Nowadays, text messages can include media (such as photos, music and videos) and are also called media messages. Text (Chrome app), a text editor for the Google Chrome web browser