SIM Cards and Mobile Connectivity for Digital Signage
Multi-network SIM cards and managed mobile data for connected screens and distributed signage estates.
Keep digital signage connected with multi-network SIM cards and managed mobile data from SIMSY. Built for connected screens and distributed signage estates, SIMSY provides resilient cellular connectivity with multi-network failover, remote management and network-level isolation.
Growing scale, growing attack surface
Digital signage networks are growing in scale and strategic importance. As cloud-managed displays become more common, they also become more vulnerable. Real-world incidents show what happens when connectivity and security are not treated as infrastructure priorities.
- Gatwick Airport (2018), a fibre cut took 1,200 screens dark for 7 hours. The displays needed just 3 Mbps each, but had no cellular failover.
- Bristol Airport (2018), ransomware spread laterally across the network because there was no segmentation between signage and other systems.
- Samsung MagicINFO (2025), an unauthenticated remote code execution vulnerability was exploited for crypto mining, with a 700 MB patch required across affected estates.
- German pharmacy chain (2016), TeamViewer credentials were visible on screen, giving anyone in the building remote access to the signage network.
Resilient, isolated cellular connectivity for signage estates
SIMSY supplies multi-network SIM cards and managed mobile data purpose-built for digital signage — closing the connectivity and security gaps that have caused real-world signage failures, with no additional hardware or software at each screen.
- Multi-network SIMs prevent the Gatwick scenario, cellular backhaul keeps screens online when fixed lines fail
- CPL isolation prevents lateral movement, each screen or group is segmented at the network level, blocking the Bristol ransomware pattern
- No remote access tools needed, CPL removes the need for TeamViewer or similar tools that create credential exposure
- Remote management of SIM cards and connectivity across the entire estate without site visits
- LAN device discovery to identify and monitor every device on the signage network
- Continuous monitoring with anomaly detection and real-time alerting
What the platform delivers
Multi-Network SIM Cards
Each SIMSY SIM roams across multiple carriers automatically. Screens stay online even when fixed-line connectivity fails or a single carrier drops. The Gatwick scenario, 1,200 screens dark for 7 hours, is preventable with cellular backhaul.
CPL Isolation
Each screen or group operates on an isolated Cellular Private LAN. Lateral movement between signage and other systems is blocked at the network level, preventing the ransomware pattern seen at Bristol Airport.
No TeamViewer Needed
CPL provides secure remote access to every screen without third-party remote access tools. No credentials visible on screen, no additional software to patch, no attack surface from tools like TeamViewer.
Managed Mobile Data
Push firmware updates, restart displays, and troubleshoot issues across your entire signage estate remotely. Manage SIMs and their connectivity from one place — no engineer dispatch required for software-related faults.
LAN Device Discovery
Automatically discover and monitor every device on your signage network. Know exactly what is connected, where it is, and whether it is behaving normally.
Continuous Monitoring
Real-time monitoring with anomaly detection across your entire signage estate. Know the moment a screen goes offline, a device behaves unexpectedly, or a security event occurs.
Frequently asked questions
A multi-network SIM is the strongest option for digital signage because it removes single-carrier failure as a source of downtime. SIMSY SIMs roam across multiple UK and international carriers automatically, so a screen stays connected even when one network is degraded or unavailable. On top of the SIM itself, you also want centralised management — the ability to provision, monitor and troubleshoot the whole estate remotely — which SIMSY provides through the platform, API, CLI and MCP server.
Yes. Multi-network SIMs are particularly well suited to digital signage because screens are often deployed in fixed locations where signal from any one carrier can be inconsistent. SIMSY's multi-network SIMs pick the strongest available carrier at each site and fail over automatically if it drops, keeping the display online without any on-site intervention.
Cellular backhaul is the standard answer — a SIM in a cellular-capable media player or router keeps the screen delivering content when the wired connection goes down. The Gatwick Airport outage in 2018 (1,200 screens dark for 7 hours after a single fibre cut) is the textbook case of what happens without it. Adding a SIMSY multi-network SIM gives the display a second, independent path to the internet that survives most fixed-line failures.
Yes. Every SIMSY SIM can be provisioned, monitored, throttled, suspended or reactivated remotely through the SIMSY platform, API, CLI or MCP server. That means firmware pushes, connectivity checks, usage caps and troubleshooting can all happen without dispatching an engineer to the screen. For distributed estates this typically saves significant time and cost versus per-site SIM management.
Through the SIMSY platform. Every SIM in every location appears in one view, with usage, connectivity status, network attachment and diagnostics available in real time. Estates that grow beyond a handful of screens typically want API-driven provisioning too — SIMSY supports this so signage operators can plug SIM management into the same automation used to deploy and configure the wider fleet.
Ready to talk?
We are the founders. Drop us a direct email and we will arrange a call. No booking forms, no automated sequences. A straight conversation about your signage estate and how SIMSY can help.