Summary: Japan has introduced strict new penalties for cyclists using mobile phones or riding under the influence, aiming to curb rising bicycle accidents. Cyclists caught using phones now face up to six months in jail or a 100,000 yen fine ($655; £508), while riding drunk can lead to three years in prison or a 500,000 yen fine ($3,278; £2,541). These rules follow a rise in bicycle accidents, which now account for over 20% of Japan’s traffic incidents, as cycling grew during the pandemic. The measures build on recent laws requiring helmets and imposing fines for cycling violations.
Something similar was done in Japan for walking and texting (or looking at your phone screen). Makes sense the same would translate to all modes of transportation including cars.
https://www.bbc.com/worklife/article/20200810-yamato-japan-smartphone-ban-while-walking
Though, jail time may be a little harse for communicating with people over a phone.