Internet & Connectivity · common
为什么 WhatsApp 在中国被屏蔽？
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⚠️ SYMPTOM
WhatsApp 无法发送或接收消息——消息一直只有一个对勾，语音/视频通话也失败。
🔍 MOST LIKELY CAUSE
长城防火墙（GFW）在网络层面屏蔽了 WhatsApp、Meta、X、Google、Telegram、Signal 以及大多数西方服务——任何中国 ISP 都无法路由到这些平台。
✓ HOW TO FIX
在飞往中国之前就安装好可用的 VPN（Astrill、LetsVPN、NordVPN）。中国的 App Store 也被屏蔽，所以要在家用 WiFi 下下载。免费 VPN 不起作用——付费方案通常能撑 6–12 个月才被封。
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