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For the wireless connections listed (Telstra, Opus, and Vodaphone), I do wonder how much of this are on the same physical tower and network. Certain parts of this multi-home connection would be running off the same physical network due to how wireless providers provision out their towers. They will share physical space on a tower and even an underlying fiber run out to the local POP.

This may be a situation of someone being too clever by half.

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In Australia - Telstra, Optus, and Vodafone maintain their own independent mobile networks & equipment (Telstra having the most coverage in rural areas).

If the author used 3 MVNOs from the same network, then it'd be silly.

Telstra, Optus, and Vodafone might share the same physical tower though (while using different antennas and RRUs). But that's only an issue if there are severe interference issues there (on all the bands the author is connecting to) or if the tower itself suffers some catastrophic damage.

As long as the bottleneck isn't the fiber coming into the tower, then I don't see the issue. It could easily be that one company's equipment is over provisioned and overloaded while the other is fine.

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