You might not have noticed, but Sprint Nextel (S) stock has been on fire over the past few months. Like so many other comeback stories we've seen lately, the company successfully weathered the worst of its business woes and has engineered an impressive comeback. As a result, the intrepid investors who bought near the bottom have been handsomely rewarded. And as we reach the halfway point in a year full of telecom dealmaking, Sprint approaches an important one-year anniversary. Fool contributor Andrew Tonner breaks down how much progress this telecom company has made.