US wireless carriers plan to shutter their old 3G networks next year.

Major US wireless carriers are gearing up to shut down their old 3G networks — a process that has been fraught with delays and miscommunication as companies alert customers with older phones that it’s time to upgrade. To that end, Verizon and AT&T have published guides to which devices will stop working after their 3G networks go offline next year. Here’s what you need to know.

Verizon has delayed its CDMA 3G network shutdown several times but is now firmly committed to shutting the network down by December 31st, 2022. All 3G basic phones and smartphones will lose service, but some 4G devices will be impacted as well — namely, those that don’t support VoLTE (Voice over LTE). A few connected devices are affected, too; take a look at V…

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