There is a waiting period, and it is standard across virtually every correctional facility in the country including Groveland. It is not specific to that facility and it is not a punishment. It is simply the Admissions and Orientation process that every newly arrived inmate goes through before privileges become available.
During A&O, which typically runs anywhere from a few days to a couple of weeks depending on the facility and how smoothly intake moves, the inmate is being processed into the system. That includes medical screening, facility orientation, housing assignment, and the administrative steps that establish their account and their approved lists. Phone access, commissary, and visitation are all generally held until that process is complete and the inmate is formally settled into their housing unit.
Groveland is a New York State Department of Corrections facility, and NYDOC facilities follow a consistent intake framework across the system. The exact length of the A&O period can vary, but most inmates are looking at roughly one to two weeks before phone calls become available.
In the meantime, mail reaches inmates during the A&O period even when phone access has not yet opened up. Sending a letter through InmateAid now means something arrives for him during that stretch before the phones are available, which can make a meaningful difference during an otherwise very quiet and disorienting period.
Once he clears A&O and has phone access, make sure your number is already on his approved call list so the first call can come through without any additional delays.