Just made a mobile to another mobile from Australia to UK and was amazed by how clear and non laggy it was. How does the signal get sent back and forth from one side of the world to the other? Satellite or cable? Radio or fibre optic?
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If it was a clear call it was a VoLTE end-to-end call. VoLTE is a flavor of VoIP (Voice over Internet Protocol). Your call most likely went through the same route as regular IP packets go between Australia and UK — submarine fiber optics cables. It is possible your carrier paid for a better than regular quality of IP transmission which resulted in fewer packets lost and delayed. How was the quality compared to a Whatsapp call?
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