Carriers will start shutting down the country's oldest cellular network, for analog devices, in February.

How to know if you will be affected:
Cell phones. If your phone is less than five years old, or has features like texting, Internet access or a built-in camera, it's not analog. An unknown number of analog handsets are still in use. Carriers say it's less than 1 percent of all U.S. cell phones. But with 250 million cell phones in use, that could still mean a million phones.

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