[請問] 2g手機插4g卡
請問如果是2g手機,支援GSM900/1800
但因為2g訊號不好,轉而辦理4g門號
如果把4g sim卡插到只支援gsm900/1800的手機裡面
可以用3g or 4g的頻段通話嗎?
ps.長輩只有通話需求
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