Press Releases

REDCOM announces the availability of Sigma Client for Android on the FirstNet App Store

May 8, 2024

REDCOM Laboratories, Inc., a leading developer and supplier of advanced tactical communications systems for the U.S. Department of Defense (DoD), today announced the release of Sigma Client for Android on the AT&T FirstNet App Store.

With this release, REDCOM’s trusted mobile softphone is now available for first responders, providing more avenues for communication and interoperability. REDCOM’s reliable and secure Sigma Client for Android includes 2048-bit RSA encryption for voice, video, and chat and integrated Push-To-Talk (PTT) for instant communications with any user on the network. Designed for Disconnected, Intermittent, and Limited Bandwidth (DIL) environments, the Sigma ecosystem can maintain communications regardless of the emergency, improving coordination and helping to save lives.

The REDCOM Sigma Client’s user interface focuses on human ergonomics for maximum efficiency. In chaotic environments, every second counts, so the Sigma interface is designed to be as simple as possible. The latest release of the Sigma Client includes both a light mode and dark mode, so users can choose the interface that best fits their operating environment.

Sigma Client for Android can be downloaded from the FirstNet App Store at


About FirstNet

FirstNet provides America’s first responders with highly secure and reliable connectivity while on the job, whether it be a crisis or a routine task in a congested area. FirstNet provides public safety with a dedicated lane of connectivity when they need it. To help ensure first responders have as much coverage and capacity as possible, FirstNet subscribers have access to all AT&T LTE commercial spectrum bands, as well as nationwide Band 14 spectrum. During an emergency, this band can be cleared and locked just for FirstNet subscribers.

All Applications listed in the FirstNet catalog have been scanned for malware and security vulnerabilities to protect the public safety community. Certified apps have passed more stringent security assessments.



REDCOM Laboratories, Inc. specializes in the development of advanced strategic, operational, and tactical communication solutions with a focus on interoperability, flexibility, and ease of use. REDCOM’s tactical products are optimized for low size, weight, and power (SWaP), making them the ideal communications core for denied environments or deployments to the tactical edge. REDCOM’s customers include all branches of the military, government agencies, emergency responders, integrators, and enterprises. All REDCOM products are proudly designed, built, and supported in the United States. For additional information, please visit the REDCOM website at