How to manage connectivity for thousands of devices

Your pilot of 50 devices worked. Now the order is for 5,000, and the spreadsheet that tracked every SIM can't keep up. Single-carrier SIMs that were fine in one city for a smart camera install start to struggle in new regions.

To manage connectivity for thousands of devices, you need a different playbook. This guide covers what changes at scale, the five building blocks to put in place, the metrics to watch, and a step-by-step plan.

Key takeaways

• Centralize visibility: Track connection status, signal, location, and data usage for every SIM in one view.
• Automate with APIs: Use APIs for bulk activation, pausing, and plan changes so work doesn't grow with the fleet.
• Choose eUICC SIMs: Multi-carrier eUICC SIMs let you switch carrier profiles over the air without swapping hardware.
• Plan for outages: Automatic failover and policy-based rules keep devices online when one network has problems.
• Track a few KPIs: A small set of connectivity metrics shows problems early and keeps costs predictable.

What changes when you manage connectivity for thousands of devices

To manage connectivity for thousands of devices, move from manual, per-device work to centralized, automated, policy-driven control across carriers. You watch the whole fleet in one place and make changes in bulk through APIs. Rules handle failover, so people step in only for exceptions.

The Ericsson Mobility Report forecast (2024) expects cellular IoT connections to surpass 7 billion by 2030. That's a compound annual growth rate (CAGR) of around 11%. The two firms count connections in different ways, so treat each figure as its own signal instead of comparing them directly.

Growth brings new work for IoT teams. Hologram's analysis of more than 6,000 sales calls (February 2024 to December 2025) shows how common this is. Fleet management and scaling came up in 12% to 16% of calls each quarter.

The same challenges come up again and again. Teams can't see why devices go offline, and they still activate SIMs one at a time. Coverage gaps and surprise bills follow as fleets spread to new regions.

Five building blocks of fleet-scale connectivity management

Each building block below handles one part of the scale problem. Together, they form an IoT connectivity management platform that lets a small team run a large fleet.

Start with visibility, because you can't automate or secure what you can't see. Then add automation, flexible SIMs, redundancy, and security.

Centralize visibility in one dashboard

A single view of every SIM is the base of IoT fleet management. You should see connection status, signal quality, location, and data usage for each device. You shouldn't need to log in to several carrier portals to get it.

Good dashboards also send alerts when something looks off. You might get an alert when a device suddenly uses five times its normal data. Another alert might flag a group of SIMs dropping offline in one city.

Keep the scope clear. A connectivity dashboard tracks the connection layer, such as whether a device is online and how much data it uses. Your device data, like sensor readings or video, stays in your own application platform.

Hologram's centralized SIM management dashboard gives you this connectivity view across your whole fleet. Teams use it to spot problems, pause SIMs, and check usage from one screen.

Track every SIM by its ICCID

What is an ICCID? An ICCID (integrated circuit card identifier) is the SIM card serial number, a unique number that identifies each SIM. ITU's ICCID numbering standard (Recommendation ITU-T E.118) uses this number for both physical SIMs and embedded SIMs (eSIMs).

Use the ICCID as the key that ties each SIM to a device record. Add it to your inventory, your API calls, and your support tickets. Record it when you install each device, so you can find the right SIM fast.

Automate provisioning and changes with APIs

Clicking through a web page works for 50 SIMs. It doesn't work for 10,000. An application programming interface (API) lets your own systems send commands straight to the connectivity platform.

With APIs, you can activate SIMs in bulk, pause devices that leave service, and change data plans for whole groups at once. You can also send SIM status to tools your team already uses, like fleet software or a ticketing system.

Bulk SIM provisioning through an API turns repeat clicks into one repeatable script. Hologram's IoT API capabilities guide walks through common calls and use cases.

Use embedded SIM cards and IoT eSIM

An embedded SIM card sits inside the device instead of going in as a removable card. IoT eSIM lets teams send carrier profiles to devices over the air. Hologram sends eSIM profiles for IoT to embedded SIM chips by QR code, activation code, or device management platform.

An eUICC (embedded universal integrated circuit card) is a SIM that can store and switch carrier profiles remotely. A profile holds the details a device needs to join a carrier's network. With eUICC, you change carriers over the air instead of mailing new SIMs.

SGP.32 is the standard from GSMA, the global mobile industry group, for remote eSIM management in IoT devices. The GSMA SGP.32 specification covers "the remote provisioning and management of the eUICC in IoT Network Constrained and/or User Interface Constrained Devices." In plain terms, it lets you manage profiles on devices with no screen or limited network access.

Multi-carrier IoT SIMs add coverage on top of that flexibility. A Hologram global eUICC IoT SIM connects to 550+ carriers in 190+ countries. Devices can join a strong local network wherever they ship.

Build in redundancy and orchestration

Every network has an outage at some point. Multi-carrier SIMs help because a device can fail over to another carrier when its current one goes down. Automatic failover means the switch happens without a person stepping in.

Redundancy can also go deeper than the radio network. Hologram's Outage Protection dual-core SIMs add a backup core, the system that routes traffic behind the carriers. Outage Protection comes with a contractual 99.95% uptime service level agreement (SLA).

Orchestration adds rules on top of failover. Hologram offers SIM orchestration with Conductor, which lets teams set policies for profile switching, network routing, and bulk recovery. Conductor is in alpha today, with broader availability and full API support coming.

Tip: Test failover rules on a small group of devices before you roll them out to the whole fleet.

Secure every connection

Security at scale comes from applying the same rules to every SIM. An access point name (APN) is the gateway a cellular device uses to reach the internet or a private network. A private APN keeps device traffic on a network path you control.

Add three habits on top of private networking:

• Give each team member only the access they need.
• Set usage alerts that catch a SIM used in the wrong device.
• Define clear security needs for every device model before launch.

For a deeper reference, NIST IoT device guidance (SP 800-213) explains the role of IoT devices as elements of federal systems. It also gives guidance for the unique risks such devices can present. This is 2021 US federal guidance, so private fleets can use it as a helpful reference, not a mandate.

To see how private networking works on cellular, read about cellular IoT network security at Hologram. It explains how teams keep fleet traffic on controlled paths.

Connectivity for fleets

Hologram gives IoT teams the connectivity layer they need at fleet scale. More than 6,000 businesses use it across 550+ carriers in 190+ countries. The platform has 100% historical uptime, and Hologram ranked #1 in G2's Spring 2026 Implementation Index for IoT Management.

• Hologram dashboard: See connection status, signal quality, location, and data usage for every SIM in one place, with proactive alerts.
• Hologram APIs: Activate, pause, and update SIMs in bulk, and connect SIM status to your own fleet tools.
• Hyper SIMs: Choose eUICC SIMs in SGP.02 or SGP.32 variants to match the remote profile standard your devices support.
• Outage Protection: Keep devices online with core-level redundancy, backed by a contractual 99.95% uptime SLA.
• Conductor: Set policies for profile switching, network routing, and bulk recovery. Conductor is in alpha, with broader availability and full API support coming.
• eSIM profiles: Send carrier profiles over the air to embedded SIM chips by QR code, activation code, or device management platform.
• Hybrid satellite-cellular: Use one SIM that runs on cellular first and falls back to satellite in remote areas like farms and open sea.

Hologram manages the connectivity layer only. Your device data stays in the cloud or application platform you choose.

Metrics to track across your fleet

A key performance indicator (KPI) is a number you track to judge how well something works. Pick a small set of IoT connectivity KPIs and review them on a set schedule.

Trends matter more than single readings. A slow drop in signal across one region can point to a carrier change. You can fix it before devices go offline.

Managed connectivity provider or do it yourself

Some teams sign contracts directly with each carrier. Others use managed IoT connectivity, where one provider bundles carriers, tools, and support. Here's how the two compare.

Direct contracts can make sense for a fleet that stays on one network in one country. For multi-region fleets, a managed provider cuts the work. The best providers act like a partner, with clear pricing and honest advice that fits your fleet.

A step-by-step plan to scale your IoT deployment

Use these six steps to move your fleet from pilot to production.

1. Audit your fleet: List every device, SIM, carrier, data plan, and location you have today.
2. Pick eUICC SIM hardware: Choose SIMs and modules that support remote profile changes, and check modem compatibility early.
3. Centralize management: Move every SIM into one dashboard so your team works from one source of truth.
4. Automate routine work: Use APIs for activation, plan changes, and pausing so no task depends on manual clicks.
5. Set alerts and policies: Create alerts for usage and outages, plus failover rules for carrier problems.
6. Review KPIs quarterly: Check KPI trends every quarter and adjust plans, carriers, and rules as the fleet grows.

Cellular IoT keeps growing, and each new device should be easier to add than the last. With visibility, automation, and flexible SIMs in place, your next 10,000 devices become routine work.

Ready to plan your next phase? Talk with an IoT expert