Wi-Fi Calling、WhatsAppまたはFaceTime使用。
主なポイント
- 旅行前にWi-Fi Callingアクティブ化。
- WhatsApp/FaceTime使用。
- Skypeで番号アクティブ維持。
- 代替番号共有。
- VoIP通話にeSIMデータ。
結論
Wi-Fi Callingで無料通話。
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