I have a couple questions that I am hoping someone here may be able to answer. From what I understand, Sprint iPhones cannot be unlocked to be used with other carriers and Verizon iPhones come factory unlocked. When I received a replacement iPhone from the Apple Store and I first set it up, I had the option to choose my carrier (Verizon, Sprint and a couple others.) By choosing the carrier, does it lock the phone to that carrier? Aren't Verizon iPhones always unlocked? This leads me to the next question: I bought a used Verizon iPhone from a friend and I had it activated on the Sprint network. It works 100%. I have a friend who needed a loaner phone and I had a spare Sprint iPhone 5 that she took to the Verizon store and they told her it cannot be used on Verizon because "the bands are different and the way the phone connects to the towers is completely different." Was this bs? The iPhone I have that had been previously used on Verizon, works flawlessly on the Sprint network, so are they interchangeable or not? I am getting another replacement phone in a few days after some issues came up with this one. As a Sprint user, if I choose the Verizon option while setting up the new phone, will it be locked to Verizon or will I still be able to use it on Sprint? I know this sounds self explanatory, but obviously, the phones are interchangeable on both networks in some circumstances. Thank you.