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The same has happened to me.
I have sent Liam a PM
We haven't received your PM. Can you send it again please, with all the information requested above.
I've found a solution to this that seems to allow me to tether without being charged.
I'm on Android P on a Pixel 2 XL. I followed this comment on reddit to remove the HS APN.
The steps I followed were:
Add the MMS APN settings back with the following steps: