Most new inmates go through an orientation period before phone and visitation access is activated. At Florida state facilities, that process typically takes about a week. During that window, the inmate is being classified, assigned to a housing unit, and briefed on facility rules and programs. Phone lists, approved visitor lists, and commissary accounts are all set up as part of that process.
There is a way to potentially speed things up. Inmates who are proactive about communicating with their counselor or case manager, asking the right questions and being cooperative during intake, sometimes get family contacts approved faster than the standard timeline. It depends on the inmate's willingness to engage and how responsive the counselor is.
In the meantime, send a letter as soon as possible. Mail reaches new inmates at most facilities even before their phone access opens up. Include your phone number clearly so they have it ready to call you the moment their privileges activate.