I don't understand "locked" vs. "unlocked" and why
crwdns2934249:0crwdne2934249:0:
I’m hoping to find a cellphone friend who can help me understand why my U.S. Cellular Samsung Galaxy S5 does suspicious stuff other phones don’t do (and the other way around, my phone doesn’t do things other S5s do), and why I can’t just buy another one used and use it instead. It has to be a “U.S. Cellular” one. Obviously there is something I don’t understand. What is it?