Amazon has a pretty cool promotion going on right now. They are offering you a $25 Amazon Gift Card when you open a new line of service with Sprint. Now it's not limited to just the Galaxy S5 or HTC One M8 either. Basically any phone that Amazon sells on contract (yes you have to sign a new two-year contract with Sprint unfortunately), will get you a $25 Gift card which you can use for a Galaxy Tab S, or maybe some cases for your new smartphone? Check out the link below for all the qualifying smartphones on Sprint.