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AT&T Encrypted Mobile Voice

AT&T Encrypted Mobile Voice Service

Help Protect Conversations with AT&T Encrypted Mobile Voice 

Today, mobile phones handle voice communications that are often highly confidential or sensitive in nature. To protect those calls, we offer AT&T Encrypted Mobile Voice, a powerful security solution that provides support for BlackBerry® and Windows® mobile devices on AT&T GSM and Wi-Fi networks.

AT&T Encrypted Mobile Voice combines hardware and software to transform smartphones into protected devices that support government-grade classifications and provide end-to-end security features for calls. It supports the Controlled Unclassified Information security designation of Sensitive But Unclassified, and is FIPS 140-2 certified.

How It Works: The Hardware and Software Difference


The solution starts with the KoolSpan TrustChip®, a self-contained crypto engine that delivers hardware authentication and call encryption for calls between AT&T Encrypted Mobile Voice users. It fits easily into your smartphone’s microSD™ slot, can be shipped unbranded, and is managed securely over the air.

The KoolSpan TrustChip provides the hardware anchor for One Vault Voice™ from SRA International—an application that integrates seamlessly with your smartphone to let you easily make and take encrypted calls from trusted contacts in just a touch.

Watch how AT&T Encrypted Mobile Voice delivers end-to-end mobile call security for you and your trusted contacts.

AT&T Encrypted Mobile Voice Features

  • Optimized for enhanced performance on the AT&T GSM and Wi-Fi networks
  • Includes advanced security features using KoolSpan’s TrustChip and SRA International’s One Vault software
  • Has a global reach, for use in the more than 190 countries worldwide where AT&T provides data roaming
  • Provides broad coverage that isn’t limited by legacy Circuit Switched Data
  • Uses enhanced power management



AT&T Encrypted Mobile Voice is available for $24.99 per month per device.* For more information, contact an AT&T representative at 1-240-880-4400 Option 2 or 1-877-744-0194.

*Additional TrustChip hardware, applicable software, and relay servers must be purchased separately. Data rates apply to encrypted mobile calls. When using your service outside the U.S., Puerto Rico, or U.S. Virgin Islands, international roaming rates also apply. AT&T Encrypted Mobile Voice can use a significant amount of data, and international data roaming rates can accumulate quickly. Additional charges and restrictions apply.

Important Information: Coverage not available in all areas. Availability, security, speed, timeliness, and uninterrupted use of service are not guaranteed. Compatible device required. Additional hardware, software, services, and/or network connection may be required depending on selected solution. Offer subject to change. Additional terms and conditions apply.

Learn more about AT&T Encrypted Mobile Voice and see the full Terms and Conditions.

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