Steered vs Unsteered SIMs: What’s the Difference?

If you're deploying SIMs for IoT devices, fleet tracking, CCTV, or any M2M application, you've probably come across the terms "multi-network" or "roaming" SIMs.

But not all multi-network SIMs are created equal. The critical difference is between steered and unsteered SIMs — and choosing the wrong type can leave you with connectivity problems that are impossible to fix remotely.

What Are Unsteered SIMs?

An unsteered SIM will automatically connect to whatever network it considers "best" based on signal strength and availability. It roams freely between networks without intervention.

Advantages:

• Simple — no management required
• Good for devices that move frequently between locations

Disadvantages:

• You have no control over which network it connects to
• May connect to a congested network even when a better option is available
• If the SIM "sticks" to a poor network, you can't fix it without physical access to the device
• Troubleshooting is difficult — you don't know which network the device is using

What Are Steered SIMs?

A steered SIM gives you active control over network selection. From a management portal, you can force any device to connect to a specific network — Vodafone, O2, EE, or Three — in real-time.

Advantages:

• Full control over network selection
• Fix connectivity issues remotely (steer away from congested or faulty networks)
• Better for troubleshooting — you know exactly which network each device is using
• Optimise performance by steering devices to the best network for their location

Disadvantages:

• Requires occasional management (though this can be automated)
• Slightly higher cost per SIM (typically £0.50–1/month more)

Real-World Example: Remote CCTV

With an unsteered SIM: You have no idea why the quality has dropped. Is it the camera? The encoder settings? Network congestion? You'll probably need a site visit to diagnose. That's an engineer callout, travel time, and downtime — potentially costing hundreds of pounds.

With a steered SIM: You check your portal and see the camera is connected to O2. You know O2 has a congested mast in that area. You steer the SIM to EE. Within 60 seconds, the camera is streaming at full quality. Problem solved — no site visit, no engineer callout, no downtime.

Which Should You Choose?

Choose Unsteered If:

• Your devices move constantly (e.g., personal GPS trackers)
• You have no IT resource to manage SIMs
• Connectivity is non-critical (nice to have, not essential)

Choose Steered If:

• Devices are in fixed or semi-fixed locations (CCTV, sensors, fleet vehicles with regular routes)
• Connectivity is mission-critical (security, payments, monitoring)
• You need to troubleshoot remotely without site visits
• You want to optimise performance across a large deployment

For most business and industrial deployments, steered SIMs are the right choice. The small additional cost per SIM is dwarfed by the savings from avoiding even a single unnecessary site visit.

How SimpliWiFi's Steered SIMs Work

Our MultiNet SIMs connect to all four major UK networks: Vodafone, O2, EE, and Three. From our management portal, you can:

• Steer any SIM to a specific network in real-time
• Monitor usage across your entire estate
• Bulk-manage thousands of SIMs simultaneously
• Set alerts for unusual data usage or connectivity drops

For IoT deployments (CCTV, fleet, metering, industrial), we also offer dedicated IoT SIM plans from just £1/month per SIM.