“if your Rav says the phone is assur, would you stop using it?”
If a rav assurs something for no reason, then I’d probably try to find out what it is about it that’s assur and ask some more poskim.
But why are we discussing this? Did a rav EVER give out such a p’sak? No rav ever did such a reckless thing, and you know it. So stop pretending the Internet is as neutral as the phone.