I bought the $. 99 sim but could not make or receive calls about half the time (although the data worked well). A few days after I downgraded to the free plan (and put a different company's sim into my phone) sure enough, I saw a $5 charge on my card. I don't remember seeing this mentioned anywhere in the contract (but perhaps it was in the fine print), and hopefully it's a one-time deal. Since the phone service stinks and I don't plan to use their sim again, I plan to contact my bank to block them in the future. Remember the adage: "If something sounds too good to be true, it probably is."? I don't mind paying for phone service, but to be given the impression that a service is free, only to sneak in hidden fees, is dishonest. Fortunately it was only 5 bucks, but it looks like Freedom pop is playing the math game and counting on uninformed customers (suckers) to make their money. Stay away from them!