Overview

• Residents of the Federal District and 12 municipalities in Goiás, Mato Grosso do Sul and Mato Grosso are set to receive clearly labeled test messages starting at 15:00 Brasília time.
• The alerts use Cell Broadcast to push a loud, on-screen notice to all compatible phones in the area, overriding silent mode and requiring no prior registration.
• Reception is free and depends on 4G or 5G connectivity, with compatibility primarily on smartphones released from 2020 onward and no delivery if the device is only on Wi‑Fi.
• Authorities ask recipients to tap OK to acknowledge the message and to avoid calling 192, 193 or 199 during the drill so real emergencies are not disrupted.
• This Center-West demonstration is the final step before full availability in the region next month, with local guidance in Campo Grande citing a 14:00 start that differs from the 15:00 Brasília schedule.