I have terrible coverage with Sprint with both our handsets. The iPhone 4S is now out of contract so I can finally drop them without paying ransom *cough* Early Termination Fee (ETF). I asked Sprint to unlock it so I can take it with me to another carrier. It's fully paid for after all, I own it, right? So they gave me a Master Subsidy Lock (MSL) code. Problem is that nobody at AT&T nor T-Mobile knows what to do with that. I can't find any information online. What do I do with this code? How do I apply it? Are they just pulling my leg? Any information is appreciated. If this works, then I'll pay the ETF for the iPhone 5 as well.