Call customer service at to ask for the specific reason for the block.

You cannot override the system yourself. You must take one of these steps:

However, the stakes change when a call is blocked for security reasons. Correctional facilities retain the right to block numbers for a variety of reasons, including suspected harassment, three-way calling violations, or contact with victims or co-conspirators. If a number is blocked due to a security flag, the process to unblock it shifts from a financial transaction to an administrative appeal. The recipient must contact the facility’s administration or the specific prison mail and phone supervisor. This process often requires proving identity and demonstrating a legitimate reason for contact, such as a familial relationship or legal necessity. It is a gatekeeping measure that requires the free citizen to submit to the scrutiny of the carceral institution simply to speak to a loved one.

Alternatively, call their customer service at if you have exceeded spending limits or have a new number that needs verification. Global Tel Link (GTL) / ViaPath :

. Because correctional facilities use external automated systems, standard phone settings may not always be enough to restore communication. JustAnswer 1. Check Your Personal Device Settings

Carriers often flag correctional facility numbers as "Scam Likely" or "Potential Spam." Not Getting Calls? - Colorado Department of Corrections

Ensure "Spam Protection" isn't auto-rejecting jail numbers.