Your own Cellular Private LAN in minutes
Connect two or more SIMs into a secure, isolated private network over cellular. No VPN. No public IP. No infrastructure. Just plug in and go.
From order to connected in three steps
SIMSY's SIM-to-SIM technology creates a private cellular network between your devices. Each SIM in your group gets a private IP address and can communicate directly with every other SIM — completely isolated from the public internet.
Order your SIMs
Choose your pack size and pick physical SIM or eSIM for each device. Pay online and your eSIMs are delivered instantly. Physical SIMs ship same day.
Activate your Private LAN
Your portal account is created automatically. Log in to see your private IP assignments, grab your API keys, and configure routing — all self-service.
Connect and build
Insert SIMs into your devices. They automatically join your private LAN and can communicate immediately. Use the API to manage everything programmatically.
Built for developers and edge computing
Everything you need to deploy secure, private connectivity for AI agents, IoT devices, and edge workloads.
Private by default
Traffic between your SIMs never touches the public internet. Each private LAN is fully isolated at the network level with default-deny for external traffic.
API-first control
Provision SIMs, configure routing, set up webhooks, and monitor usage entirely through RESTful APIs. Full programmatic control over your network.
Agentic-ready
Purpose-built for autonomous AI agents that need secure, isolated connectivity at the edge. Lock down agent-to-agent communication to your private LAN only.
Multi-network coverage
Your SIMs connect across multiple mobile networks for maximum coverage and reliability. Works anywhere with cellular signal.
URL locking & IP whitelisting
Restrict outbound traffic to approved domains. Whitelist specific IP addresses. Complete control over what your devices can reach.
Webhooks & events
Get real-time notifications for SIM events — online/offline status, data thresholds, security alerts. Build event-driven network automation.
Full API access from day one
Every SIMSY starter pack comes with API keys and full access to the SIMSY platform. Manage your private LAN programmatically, integrate with your existing stack, or build custom automation.
- RESTful API with comprehensive documentation
- MCP server integration for AI agents
- Webhook subscriptions for network events
- Real-time SIM status and diagnostics
- Programmatic provisioning and routing
- Usage monitoring and billing APIs
# Check your private LAN status
import simsy
client = simsy.Client("your-api-key")
# List SIMs in your private LAN
sims = client.get_sims()
for sim in sims:
print(f"{sim.name}: {sim.private_ip}")
print(f" Status: {sim.status}")
print(f" Signal: {sim.signal_strength}")
# Send data between SIMs
client.send_sms(
to="edge-agent-01",
message="heartbeat:ok"
)
# Set up a webhook for events
client.create_webhook(
url="https://your-app.com/events",
events=["sim.online", "sim.offline"]
)Private cellular networking for any edge workload
Secure agentic AI deployment
Deploy autonomous AI agents on edge servers with isolated private connectivity. Lock down agent communication to your private LAN — no public internet exposure, no attack surface.
Industrial IoT networks
Connect sensors, controllers, and gateways across remote sites on a private cellular network. Ideal for environments where Wi-Fi and ethernet are impractical or insecure.
Distributed edge clusters
Network edge computing nodes across multiple locations into a single private LAN. Route traffic between sites without VPN complexity or fixed-line dependencies.
Secure device management
Remotely access and manage devices deployed in the field. Combined with InHand routers, create fully managed edge environments with URL locking and IP whitelisting.
Network testing & prototyping
Spin up isolated private networks for testing distributed applications, simulating edge deployments, or prototyping IoT solutions — all on real cellular infrastructure.
Air-gapped cellular networks
Create cellular networks that are completely isolated from the public internet. Perfect for high-security applications where data must never traverse public infrastructure.
Common questions
Everything you need to know about SIMSY Cellular Private LAN.
A Cellular Private LAN is a private network created between two or more SIM-enabled devices using cellular infrastructure. Unlike a VPN or traditional networking, the traffic between your devices is isolated at the network level — it never passes through the public internet. Each SIM in your group gets a private IP address and can communicate directly with every other SIM in the group. Think of it as your own private mobile network.
If you choose eSIMs, your QR codes are delivered instantly after payment and you can be connected within minutes. Physical SIMs are dispatched same day. Your portal account and API keys are created automatically when you place your order.
Yes. You can add additional SIMs to your private LAN at any time through the portal or via the API. Each new SIM is automatically assigned a private IP and can communicate with all existing SIMs in your group.
Both provide identical functionality on your private LAN. A physical SIM is a removable chip you insert into your device. An eSIM is a digital SIM provisioned via a QR code — no physical card needed. Choose eSIM for instant activation, or physical SIM for devices that don't support eSIM.
SIMSY uses a simple pre-pay model. Your starter pack includes credit (e.g., £20 with the Developer Starter). Data usage is deducted from your credit balance on the Militre tariff. When your credit runs low, top up anytime through the portal. No contracts, no monthly fees, no surprises.
Yes. Traffic between SIMs in your private LAN is isolated at the network level. It does not traverse the public internet. External inbound traffic is denied by default. You can optionally configure URL locking and IP whitelisting for additional control over outbound traffic.
Any device that accepts a SIM card or eSIM — industrial routers, USB cellular dongles, smartphones, tablets, IoT gateways, single-board computers (Raspberry Pi, etc.), laptops with SIM slots, and more. If it connects to a cellular network, it can join your SIMSY private LAN.
Absolutely — this is one of the primary use cases. Deploy AI agents on edge servers connected via SIMSY private LAN. Agents can communicate securely without public internet exposure. Combined with an InHand router, you can lock down the agent's network access to only approved URLs and IPs, creating a fully secured agentic edge deployment.
Ready to build your private network?
Get started with two SIMs and £20 credit. Be connected in minutes.