使用WiFi通话、WhatsApp或FaceTime。
要点
- 旅行前激活WiFi通话。
- 使用WhatsApp/FaceTime。
- 通过Skype保留号码活跃。
- 分享备用号码。
- 用eSIM数据用于VoIP。
结论
WiFi通话免费电话。
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