Sentinel Push-to-Talk Logo
    Nationwide Coverage

    Three Carriers.
    One Unbreakable Network.

    Sentinel utilizes AT&T, T-Mobile, and Verizon networks. That means your team stays connected across all 50 states by automatically switching to the strongest signal.

    Check Your Area
    3
    Carrier Networks
    AT&T + T-Mobile + Verizon
    99%+
    U.S. Pop. Coverage
    LTE & 5G
    99.99%
    Uptime SLA
    Mission-critical grade
    50+
    States Covered
    Including U.S. territories
    Interactive Coverage Check

    Verify Signal in Your Area

    Sentinel's coverage is the combined footprint of AT&T, T-Mobile, and Verizon. Enter your zip code below to check signal strength for each carrier.

    Note: Multi-carrier roaming capabilities depend on device hardware. Not all devices support the frequency bands for all three networks. Contact our team to verify device compatibility for your required coverage area.

    Combined AT&T, T-Mobile, and Verizon nationwide coverage map

    Check Coverage by Zip Code

    Enter your zip code to verify AT&T, T-Mobile, and Verizon LTE/5G signal in your area.

    Coverage maps represent carrier-reported data. Actual signal may vary based on terrain, building materials, and network congestion. Sentinel's multi-carrier design addresses all three factors.

    How It Works

    Why Multi-Carrier Changes Everything

    Most PTT providers rely on a single carrier. When that network has issues, so do your communications. Sentinel is different.

    Your Device
    Multi-carrier SIM
    AT&T
    Primary path
    T-Mobile
    Redundant path
    Verizon
    Redundant path
    Servers
    Distributed
    Your Team
    Always connected
    • Automatic switching between networks for maximum uptime
    • Nationwide LTE and 5G across all 50 states
    • Coverage in U.S. territories including Puerto Rico
    • Canada roaming available for cross-border operations
    • Wi-Fi calling as a fallback layer
    • In-building penetration improved with multi-carrier path
    Network Reliability

    Built for Teams That Can't Afford Downtime

    Coverage is only part of the story. Sentinel's architecture is designed from the ground up to keep mission-critical communications running.

    Carrier Redundancy

    Your devices utilize AT&T, T-Mobile, and Verizon networks. If one carrier has a localized outage or poor signal, the device automatically switches to the strongest available network.

    Wi-Fi Fallback

    In buildings, basements, or areas with limited cellular, devices automatically failover to Wi-Fi, keeping push-to-talk active without any interruption.

    Distributed Server Infrastructure

    Sentinel's backend runs on geographically distributed, redundant servers. No single point of failure means your communications stay up even during regional outages.

    International Roaming

    Global PTT coverage is available for teams that operate internationally. Contact our team to enable international data plans for your deployment.

    Encrypted Transmission

    All voice and data traffic is encrypted end-to-end, meeting compliance requirements for public safety and regulated industries.

    Sub-Second Call Setup

    Sentinel's network is optimized for low-latency push-to-talk. Calls connect in under one second, even in congested network conditions.

    Coverage FAQ

    Common Coverage Questions

    Ready to Deploy Where Others Can't?

    Talk to our team about your coverage requirements and deployment needs. We'll map out exactly what your team can expect.