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Smartphone reviews often ignore an increasingly important feature: the ability to switch from one cellular carrier to another. Here's why that capability matters. How To Unlock A Locked Iphone 5 Without Password. The decline of long-term cellular contracts, together with intense price competition, means that consumers can really shop around, when they find a better deal. Secondly, there's little reason these days to buy a new phone when you make that switch. Phones aren't improving as fast as they used to—today's models are only moderately better than two-year-old phones when it comes to cameras and displays. And many phones are tougher, too. So an unlocked phone you buy today can easily last three years or longer.