You might try mailing a letter or postcard. The guards are normally not permitted to pass notes to inmates from the outside. All correspondence is supposed to be monitored and cataloged.
https://www.inmateaid.com/ask-the-inmate/since-the-guards-won-t-let-my-inmate-know-that-i-want-them-to-call#answer
Accepted Answer Date Created: April 01,2016