Introducing CriticalLinc. The network you trust has gone mission critical.

4G Advanced LTE network goes beyond reliable.

Explore Your Options
The network you trust has gone mission critical.
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We've built redundant network data centers in Birmingham and Atlanta with backup power systems in each location.

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Each cell site has an emergency generator or backup fuel cell to keep the power running for days during an outage.

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We secured the CriticalLinc network in lockstep with Southern Company's multilayer, 24/7 IT security systems.

Mission critical Push To Talk that just won't quit.

Icon of Chat Bubble Basic MCPTT

We've enhanced our basic Push To Talk service. Starting in late 2018, CriticalLinc customers will have access to two-way private PTT calling and group PTT calling - plus some valuable new features:

  • Broadcast Group Calling
  • Talk Group Scanning
  • User Presence (2019)
  • Ad hoc Group Calling
View Plan

Icon of Lightning Bolt High Performance MCPTT

High Performance MCPTT will be available late in late 2018 for $10 a month on the Sonim XP8 plan. It includes features that improve on the Basic MCPTT plan.

  • PTT Map
  • PTT Message
  • Emergency Call
View Plan
Image of Push to Talk Phones
Mission critical Push To Talk that just won't quit.

Mission critical situations demand smart communication, connectivity, and flat-out ruggedness. SONIM phones stand out when all other devices fail. The XP8 and XP5s are the toughest, most reliable phones that money can buy. Their performance in punishing environments earned them their spot in the CriticalLinc LTE lineup.

Pick a Phone
Image of a Push to Talk Icon
Get Push To Talk on any smartphone with Linc PTT.

Linc PTT is our smartphone Push To Talk (PTT) app that lets Android and iOS smartphone users communicate with each other and Southern Linc phones.

Install Now
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Coverage Icon We've got the Southeast covered.

Our mission critical LTE coverage is designed to be highly reliable. LTE network coverage is similar to iDEN coverage, but not exactly the same. Use the interactive map below to see the coverage in your area.

Coverage depiction does not a guarantee data speed or service availability. Coverage may not be available everywhere and is subject to change.

View Our Coverage