T-Mobile once again shook up the mobile world this week when it announced that it would pay off the early termination fees of any new subscriber who switched over from a rival carrier. Like all deals, however, there is some fine print that you should read before agreeing to take it. Ars Technica’s Jon Brodkin notes that T-Mobile will only agree to pay off your ETFs if you turn in your old device and buy a new one through the carrier. What’s more, Brodkin calculates that it given the cost of paying for a whole new device on T-Mobile and paying for a $60 monthly over the span of two years, it would actually be cheaper for him to leave Verizon