Comment by tsimionescu

Your phone has access to the radio spectrum under certain limited conditions, everywhere in the world. People who want to sell devices that can emit in the radio spectrum must make every reasonable effort to not allow the devices they sell to operate outside the conditions. I would bet that carrier contracts and rules around requirements for VoLTE and VoNR are codified in the exact same way. There is no legal right to use any device you like on your carrier's network - most likely, your contract with your carrier instead has an explicit series of devices that you are allowed to use, and this is also backed up by your country's laws by not being allowed to emit in the radio spectrum unless you do it through one of the certified carriers and under their conditions.

So, if Google were aware of a hack that allows users of their devices to circumvent conditions put in place by carriers against misuse of their network, and Google did nothing to patch this, Google could lose their license to produce devices which can access the radio spectrum. You personally could also be hel liable for using these hacks, but Google would definitely be on the hook, and could, in principle, be entirely prevented from manufacturing and selling phones, if this ever escalated enough.