According to internal T-Mobile documents obtained by Android Police, the carrier plans to fast track the shutdown of its 3G voice network, forcing some customers to buy new phones or leave the network in a matter months. Most carriers have already shut down their legacy 2G networks, so the frequencies can be re-used for LTE and 5G, and 3G's expiration date is now quickly approaching. AT&T started warning customers this week that phones without 4G voice calling would no longer work starting in 2022, and it now appears T-Mobile will be following suit with an even more aggressive timeline.

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