[問題] 泰國換sim卡，不能上網
手機是iPhone 6s
到了泰國以後換了dtac的sim卡
顯示有4G，但實際上僅能傳送簡單的line文字訊息
Line上面傳送的圖檔也無法讀取
請問應該如何改變設定？
Dtac的店員試了半天也找不出原因
懇請大家幫忙，謝謝
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