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进大陆以后再去国际站买中国 eSIM，多半买不了，充值也挂。
Nomad 中国说明里就是这口径：出发前装好，用量按全程估。别指望落地 Wi‑Fi 再补一张。
我没一家一家测过，Airalo / Holafly 那类也常看到同样提醒。机场才想起来基本晚了。