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並前往https://www.t-mobile.com/support/devices/apple/apple-ios-15/network-apn-and-volte-ios-15

Network, APN, and VoLTE: Apple iPhone on iOS 15 - T-Mobile

Learn about network settings on an iPhone running Apple iOS 15. On this page: APN & data settings; Manual network selection; Switch 2G / 4G / 5G; Data Mode ...

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