For those of us that have purchased cellular phones on Ebay or Craigslist, we understand the need to get the skinny on what we’re buying. For instance, if a phone is carrier-locked, that means it’s worth way less and a potential buyer could be buying a brick (or a unlocking headache.) Fortunately all phones around the world come with an IMEI code, and if you plug that into the website IMEI.info, you’ll get all the relevant technical details. For instance, this is my phone. Even nicer, if you’ve got an iPhone, it will tell you what carrier it’s on and whether it’s unlocked. Next time you’re buying a secondhand iPhone, make sure to run it by this website.