With federal inmate texting, messages are relayed via the federal Corrlinks/TRULINCS approach

https://federalinmatetext886.moderncairn.com/posts/corrlinks-text-app-guide-the-best-way-to-message-federal-inmates

With federal inmate texting, messages are relayed using the federal Corrlinks/TRULINCS equipment, and replies can return to the outdoor user as widely wide-spread textual content messages.