VODAFONE VODEM STICK AND SIMS HELP

I tried to use this with a 2 degrees sime, and it will not let me, says invalid sim , so do i need to buy a vodafone sim card? are these just the standard phone ones?? and are there any other acsessories i need to run this stick?
i brought it second hand off of here,, help im all new to this,, the man i got it from says he had once used a 2 degree sim but mine wint work , and i had loaded data onto the sim too =0(,, what do i need to do please! thanks

geek_leelee79, Apr 17, 12:17 am