SHU inmates at Wasco State Prison are permitted one fifteen-minute phone call per week. That is the standard allowance for segregated housing in the California system, and it applies regardless of the reason for placement. One call, fifteen minutes, once every seven days. When that window comes up, make sure you are available to answer because missing it means waiting another full week.
On visitation approval, the California Department of Corrections and Rehabilitation processes visitor applications on a timeline that varies depending on the facility's current workload and how quickly your background check clears. A few weeks is typical under normal circumstances, though it can run longer. Submit your application as early as possible and follow up with the facility if you have not heard back after three to four weeks.
Worth knowing is that SHU placement often suspends visitation privileges on top of the phone restrictions. Even if you are already an approved visitor, contact visits may not be available while your person is in segregated housing. Call the facility and ask specifically about visitation status for SHU inmates before making plans to visit, so you are not making a trip that cannot happen yet.
In the meantime, mail still reaches SHU inmates. A letter through InmateAid is one of the more reliable ways to stay connected when phone access is this limited.