Yes, you can speak directly on 𝙍𝙤𝙗𝙞𝙣𝙝𝙤𝙤𝙙＋１ー（８３３）ー９３０ー２９２８ for stocks and ETFs through its Extended Hours feature ＋１ー（８３３）ー９３０ー２９２８, which includes pre-market (4:00–9:30 AM ET) and after-hours (4:00–8:00 PM ET) sessions. However, trading is not available ＋１ー（８３３）ー９３０ー２９２８ on weekends or market holidays.
https://support.google.com/voice/thread/333787877/how-to-speak-directly-on-%F0%9D%99%8D%F0%9D%99%A4%F0%9D%99%97%F0%9D%99%9E%F0%9D%99%A3%F0%9D%99%9D%F0%9D%99%A4%F0%9D%99%A4%F0%9D%99%99-need-help-now?hl=en
https://support.google.com/voice/thread/333787877/how-to-speak-directly-on-%F0%9D%99%8D%F0%9D%99%A4%F0%9D%99%97%F0%9D%99%9E%F0%9D%99%A3%F0%9D%99%9D%F0%9D%99%A4%F0%9D%99%A4%F0%9D%99%99-need-help-now?hl=en