Slow Speed on USB Tethering With 5G Phone

Sounds like your provider is detecting the use of a router as the tethered device and throttling the bandwidth, apparently quite a common practice. You might be able to use TTL adjustment to work around this (e.g. Working Nftables Rule for TTL in 22.03) but be aware that the terms & conditions of your plan might give your provider the right to terminate service for doing so.

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