[問題] 現在的4G手機已回收
想問關於手機4G訊號管理的問題...
有沒有哪一家廠牌可以設定,待機中只使用3G或2G訊號(自動轉換)?
如果基於需要緊急省電的理由,我覺得這個功能其實蠻重要的。
因為4G待機也只會更耗電,實在想不出待機中使用4G訊號的理由。
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