To tap potential demand from daytime salaried workers, some brokerages in Japan have started accepting share orders placed by phone during night hours on weekdays and weekends.

Aizawa-Securities Co., a Tokyo-based midsize brokerage, has been taking phone orders on weekday nights under what it calls the "blue call" service program.

On Aug. 2, the brokerage started taking phone orders on Saturdays and Sundays. The brokerage charges a uniform fee of 3,000 yen for a transaction of up to 30 million yen.