This week, AT&T began sending out an email that (rather misleadingly) told a large number of its subscribers that their phones would stop working on the network soon, and that they needed to upgrade. Straight up: this email is mostly BS. It's authentic, and AT&T sent it, but the action they're recommending you take — namely, buying a new phone — is not something you need to do for at least another 18 months, if not longer or potentially at all. Here's what you need to know.

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