海外 VoWiFi （Wi-Fi Calling）开启指南：iPhone、Android、代理规则
很多海外电话卡、香港电话卡都支持 VoWiFi，也就是 Wi-Fi Calling。它可以让手机在蜂窝信号差、无服务，或者只连接 Wi-Fi 的情况下，继续使用运营商原生电话和短信。 但 VoWiFi 不是打开一个开关就一定成功。真正成功要看三件事： 号码和套餐是否支持 Wi-F
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