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The iPhone 13 has been out for a couple of months now, which means that the deals should be getting even better. Currently, AT&T, T-Mobile and Verizon all offer iPhone 13 deals. Here are the best iPhone 13 deals from each major carrier: If you sign up for an AT&T unlimited plan and trade in your old phone, you can get up to $800 off an iPhone 13. That’s enough credit to get you the iPhone 13 Mini…