i thionk that the sim card has only 64 kb of memory for use, but its enough for showing a menu with a lot of multimedia option and carrier options, the sim card only store the menu, all services that is included in the sim card are sended OTA like a SMS to the device, and only send links or simple images, so that u heard was about a link toa video showed in a menu of sim card, and not stored in sim card, i hope u get cleared with my ans

PD: Sry about my english