I live on a campus and my parents bought me a 60 minute card as a present one day. I typed in the code and was disappointed to get a message sent to my phone saying that the code failed and that I had to call customer service. I did so and spent a good while getting transferred from one person to the next, and when I was finally given an answer, I was told that the code wasn't in their systems because the card was actually two years old. The represenitive then told me that I could not get my money back, but had to take the card back to the store I had bought it from (Rite Aid).
Of course, doing so was impossible since I'm stuck on campus and only see my parents on weekends. So sadly they wasted a good 20 bucks buying me minutes. I'm unsure if this is the fault of TracFone sending out expired cards or Rite Aid for not restocking, but either way, be careful about buying TracFone cards! You could end up wasting your cash!