Hey Megcon, welcome to the Community.
To stream music on a mobile device (I think this is what you're talking about) you'll need a Premium account.
Your friends might have been on a free trial, which we do offer in some cases. Looking at your account I can see you were on the 48 hour free trial back in October, maybe you didn't notice.
For more info please see
http://www.spotify.com/about/features/mobile-music/
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