Internet & Connectivity · common
我的外国手机在中国为什么上不了网？
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⚠️ SYMPTOM
你的外国 SIM 卡显示有信号，但移动数据无法使用，或者收到一条短信提示"无数据漫游协议"。
🔍 MOST LIKELY CAUSE
你的本国运营商与中国没有漫游协议，或者你的线路未开通数据漫游；即使有信号，你的线路在本国网络侧仍被屏蔽数据。
✓ HOW TO FIX
在机场购买中国联通或中国移动的旅游 eSIM / 预付费 SIM 卡，或者在落地前向本国运营商开通付费的每日漫游旅行套餐。
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