Yes they normally throttle your speeds down to nothing. Had a few isps over the years only one ever had a problem with Vodafone.I had them basically tell me they block stuff. I had a dead good provider which completely failed to work. I even tried a few on here and all the same when footy was on.
They summat weird Vodafone I can't remember what exactly my post about it all is on here somewhere
With sly now and zero problems and with BT zero problems