中華4G 1800頻段的EARFCN調整是否會影響U11+的手機載波聚合

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小弟常出沒的地方由於位於地下室 這邊中華有900跟1800頻道一起載波聚合
之前是900的EARFCN3650+1800的EARFCN1725一起載波聚合  會固定顯示4G+
最近幾天發現中華電信把1800的EARFCN調整成1750 結果手機只會顯示4G(沒有載波聚合的狀態)
偶爾會顯示一下4G+ 但是不到幾秒又跳回只有4G 單收900或是1800而已
不知是手機的問題還是中華電信基地台那邊設定的問題
下圖是本來沒改變之前的1800頻段EARFCN

下圖是最近發現EARFCN變更後的狀況 手機常常沒有在載波聚合狀態 當下確定是有2個頻段能同時收到

不知道是手機沒有支援還是中華基地台的設定哩 ?
(身處同一個地方 同一個基地台)還是因為某些基地台還存在GSM的1800頻段給2G緊急使用才會這樣哩

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