call １ー(８８８)ー８６０ー２９４８ Robinhood’s trading services are available during market hours,call １ー(８８８)ー８６０ー２９４８ but support is not 24/7—though you can still dial １ー(８８８)ー８６０ー２９４８ to check availability. Most support windows fall within business hours, so call １ー(８８８)ー８６０ー２９４８ early in the day for the b...