Yes, InmateAid works at FCI Florence and at federal facilities across the country. The service was actually created with federal inmates in mind, which is where it started before expanding to cover state and county facilities as well.
For federal inmates specifically, the savings tend to be meaningful. The Bureau of Prisons phone system charges rates that add up quickly over the course of a month, particularly for families who talk regularly. InmateAid's discount phone service typically saves families about $45 per month at federal facilities, which over the course of a longer sentence adds up to a significant amount.
The way it works is straightforward. InmateAid analyzes the BOP's rate structure for your specific number and location and determines whether a local forwarding number can get calls to you at a lower rate than what your current number generates. If it can, you get assigned that number and your son dials it from FCI Florence instead of your regular number. The call forwards directly to your phone and the savings kick in automatically on every call from that point forward.
Beyond the phone service, InmateAid also handles letters, photos, postcards, and magazine subscriptions for federal inmates. Everything ships from InmateAid's Florida address, keeping your home address off any mail going into the facility, and the service has been operating reliably since April 2012.
If you want to confirm the exact savings available for your specific situation before purchasing, email aid@inmateaid.com with your number and the facility details for an honest estimate.