Would it be reasonable to ask a Grab driver to lower their voice during a call?

Curious lang if normal or acceptable ito sa Grab. Sumakay ako kanina and the driver was on a group call the entire ride. Naka-earphones naman siya, hindi naka-loudspeaker, at parehong kamay nasa manibela most of the time. Wala rin siyang sinabing bastos. Ang issue ko lang, sobrang lakas ng boses niya habang nakikipag-usap, parang hindi niya napapansin na may pasahero sa sasakyan.

10-minute ride lang naman so hindi na ako nagsalita at tiniis ko na lang. Pero would it have been reasonable for me to ask him to tone it down? Or considered normal na lang ba ito sa Grab as long as hands-free at hindi naman distracted mag-drive?