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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