Firefox Relay has phone masks. I don't know if they actually work though. I never had a need to try them.

https://relay.firefox.com/

Jokes on you! I use a Firefox extension that spoofs my browser profile. https://addons.mozilla.org/en-US/firefox/addon/chameleon-ext/

It spouts convincing sounding bullshit and hopes you don’t call it out. It’s actually surprisingly human in that regard.

Oh great, Silicon Valley’s AI is just an overconfident intern!