iOS 7.1.2 jb, 5S
要去國外使用可上網的預付卡, 該預付卡是4G訊號,
目前在台灣沒有用4G, 還是停在3G (台哥大)
請問是到了國外之後換了卡之後就會自動切成4G嗎?
該卡有APN要設定這OK,
但沒上過4G的手機是否有需要另外做什麼設定? 謝謝
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