For gadget enthusiasts or anyone else who might be a fan of technology, buying a new smartphone is just awesome. The days and weeks that follow are packed with surprises as you get to know your new device and configure it to suit your needs. Selling your old phone to help recoup some of the expense involved, however, can be one of the most frustrating parts of getting a new phone. If you’re currently a Galaxy S4 owner planning to upgrade to a new Galaxy S5 when it launches next week, there are plenty of options when it comes to offloading your old smartphone. Trading it in with your carrier for a credit toward your new phone is by far