I had a contract with Sprint. I spent $85 a month because there was an 18% off discount which helped, but...then I decided I wanted the brand new Samsung Galaxy S3, and didn't have enough to pay for it outright. So, I got a second line and paid $160 per month. Eventually I just stopped paying it, and now I have more debt to my name.
Of course, if you want to know the worst part, this was after I had student loans. Needless to say I'm working on fixing this, but...it may be awhile. Old habits die hard. Though I haven't bought any real electronic device since then, so that's a start.