Sonim XP5s Ultra-rugged Feature Phone Now Supported by Mission-Critical Standards Based FirstNet^® PTT Solution from AT&T

High volume device widely used in many safety-critical applications to provide leading edge technology for a consistent communications experience.

Austin, Texas (Dec. 8, 2020) — Sonim Technologies (Nasdaq: SONM) today announced that its XP5s ultra-rugged feature phone is among the initial devices that are approved for FirstNet^® Push-to-Talk (PTT), the nationwide mission-critical standards-based push-to-talk solution.

FirstNet PTT is designed to enable public safety to use their smartphones, feature phones, and specialized ultra-rugged devices like they would use a two-way radio, with highly reliable, high-performance calling. The Sonim XP5s, which is purpose-built for critical communications, includes many features that enhance the PTT experience. Features supported by FirstNet PTT running on XP5s include:

• Dedicated PTT button – no need to wake the device up or launch the app like consumer smartphones
• Red (Emergency) Button – instantly alert dispatch and/or emergency services
• Ultra-loud speakers and noise suppression – ensure you can stay in communication in the harshest conditions
• Ultra-rugged accessories – a broad range of industrial accessories, including remote speaker microphones, wireless mics, in-vehicle mounts to address the common needs of first responders

The Sonim XP5s is FirstNet Ready™, which means first responders can use it to tap into the power of FirstNet^® — which provides public safety with the nation’s fastest overall network experience.¹  FirstNet Ready^TM devices are subject to hundreds of tests that cover several aspects, from security and durability to network impacts. This helps make sure that they can meet the needs of first responders.  First