Mobile phone customers who haven’t upgraded their phones recently might have to do so because major carriers are retiring their 3G networks this year to accommodate the more advanced 5G networks.

The Pennsylvania Emergency Management Agency, state police and the Federal Communications Commission are urging people whose mobile phones are more than a few years old to contact their service providers to find out if their phones will continue to work after the shutdown and to upgrade if they don’t.

AT&T will finish shutting down its 3G network in February, and Verizon will finish by the end of the year, according to the FCC.

T-Mobile announced that it will finish shutting down Sprint's 3G CDMA network by March 31, and Sprint's 4G LTE network by June 30. It also announced it will shut down T-Mobile's 3G UMTS network by July 1, but has not yet announced a shutdown date for its 2G network, according to the FCC.

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