Every device on the same network, wherever they are.
A cellular private LAN puts your SIMs onto a shared private subnet so they can reach each other directly. Sites spread across a country behave like equipment plugged into one switch, with nothing in the middle and nothing crossing the public internet.
A LAN without the L.
Local networks are easy to work with because everything on them can see everything else, addressing is yours to decide, and nothing outside gets in unless you allow it. SIMSY LAN gives you those three properties across a cellular estate.
Devices reach each other
Any SIM on the LAN can address any other directly. No central server relaying between them, no cloud in the path, no round trip through a data centre to talk to a machine in the next room.
Your addressing
Choose the ranges and lay out the subnets to suit your systems. Devices get private addresses that make sense inside your estate rather than whatever the network hands out.
Closed by default
Traffic to and from the public internet is denied unless you open it. The LAN is private from the moment it exists, not after you have configured it to be.
Three steps to get your own global LAN.
Create the LAN
Define it in the portal or through the API, and choose the address range you want it to use.
Add your SIMs
Assign SIMs to it. They join immediately, wherever in the world they happen to be attached.
Set the rules
Decide what the LAN can reach beyond itself, and set policy on individual SIMs where one needs to behave differently.
No setup fee, no lead time, no minimum number of SIMs and no ticket to raise. It is a configuration you control, which means you can build one, test it, tear it down and build another the same afternoon.
# Illustrative - see API reference for current endpoints
import simsy
client = simsy.Client("your-api-key")
# Create a LAN with your chosen private subnet
lan = client.create_lan(
name="edge-cluster-eu",
cidr="10.42.0.0/24",
)
# Add SIMs to the LAN by ICCID
for iccid in ["8944...001", "8944...002", "8944...003"]:
client.add_sim_to_lan(lan_id=lan.id, iccid=iccid)
# Set the policy - closed by default
client.set_lan_policy(
lan_id=lan.id,
egress="deny",
allow_domains=["telemetry.example.com"],
)When devices need each other, not just you
SIMSY LAN is the right choice whenever the traffic that matters runs between machines rather than back to a centre.
Edge clusters
Compute nodes at a site coordinating between themselves, sharing state and splitting work without a round trip to the cloud.
Multi-site estates
Several locations that need to behave as one network, without leased lines, site routers or a VPN mesh to maintain.
Autonomous systems
Robots and agents that negotiate with each other directly. Latency and privacy both improve when the conversation never leaves the private network.
Industrial control
Controllers, sensors and gateways on a flat private network, addressed the way the plant expects, without exposing any of it.
Distributed sensing
Equipment aggregating locally and sending one result, rather than every node reporting separately over the internet.
Temporary deployments
Events, sites and trials that need a working private network today and gone next month, with no hardware to install or recover.
SIMSY LAN is part of a family.
All three with the same ethos: you control the network, so you can use the techniques you would use on any network you own. Pick whichever fits, or run more than one across different parts of a deployment.
Reach one device, on demand
Generate a secure link to a device’s interface, use it, close it. Nothing stays open between sessions. Best when an engineer needs to look at something occasionally.
Bring the estate onto your network
Drive the SIM addressing from your own plan so field equipment joins your existing network properly, with your routing and your tools.
Build one this afternoon.
Get a couple of SIMs, put them in two devices anywhere you like, and watch them find each other on a network you defined.