The Google Internet speed test reported 18.4 Mbps download, 18.4 Mbps upload and Latency of 24 ms for Sydney which is more than I need. However, in Canberra it recorded only 0.53 Mbps download and 0.35 Mbps upload with 75 ms latency. This compared with 3.35 Mbps download, 0.78 Mbps upload and Latency of 45 ms for the Huawei E8372 using the Telstra mobile network. The Optus service was not enough for video conferencing in Canberra, even with the efficient Zoom product, whereas Telstra worked fine.
Overall I find the Huawei E5577 less suitable for my needs than the E8372, and the Optus service less useful than Telstra. The Optus service, as I experienced it, is not suitable for a student (or teacher) who needs Internet access.