How Cellular IoT can solve part of the PSTN problem

Time to read

4 minutes

Date published

May 2025

As the PSTN Switch Off approaches, many resellers naturally focus on upgrading Broadband and IP voice services. But there’s another layer to this transition that can easily be missed. 

What about the devices still relying on PSTN? 

From alarm systems and lift lines to ATMs and healthcare devices, thousands of non-traditional systems depend on analogue lines. And without the right connectivity replacement, these ‘things’ will stop working. 

That’s where Cellular IoT connectivity comes in. Cellular IoT is a flexible, resilient option that works alongside fixed-line services to keep mission-critical devices online.  

At Giacom, we offer a complete portfolio of connectivity solutions, including FTTP, Ethernet, IP Voice, and Cellular IoT, so our partners have a whole playbook of options to deliver the right solution for each customer scenario consistently. 

The PSTN Switch Off: It’s not just about people and voice 

The Public Switched Telephone Network has long been the backbone of UK communications, but by the end of 2027, it will be shut down for good. Most resellers are already talking to customers about IP Voice and Broadband upgrades, and rightly so. But voice and data are only part of the picture. 

A wide range of non-voice devices, such as intercoms, meters, sensors and alarms, also rely on PSTN to function. If they’re overlooked, the switch-off could lead to operational disruption. 

These ‘things’ aren’t nice-to-haves; they’re mission-critical. 

Why Cellular IoT? 

Cellular IoT uses mobile networks (4G, 5G, LTE-M, NB-IoT) to keep devices connected securely and reliably without needing fixed-line infrastructure.  

Cellular IoT connectivity is ideal for: 

• Hard-to-reach or temporary sites 

• Low-power, low-data devices 

• Critical systems that require constant uptime 

• Environments where fixed connectivity is not practical or cost-effective 

But Cellular IoT isn’t about replacing traditional connectivity but enhancing it. Sometimes, Broadband or Ethernet is the best fit; other times, IoT is the right tool for the job. 

As a Channel partner, offering both solutions gives you a stronger proposition and more chance of winning the deal.  

Typical use cases where Cellular IoT shines 

Every connected device and deployment is different; some are ideal for fibre or Ethernet, while others work better with Cellular IoT. If fixed connectivity isn’t the right fit in any of the scenarios below, Cellular IoT could be the answer.  
 
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• Alarm systems: Intruder, fire and panic alarms need uninterrupted monitoring. IoT offers secure mobile backup or full replacement. 

• Lift lines: Older PSTN auto-dialler systems can be upgraded to resilient mobile connectivity. 

• Entry and intercom systems: 4G/5G ensures reliable communication and remote management. 

• Healthcare and telecare: Devices used by vulnerable individuals must remain online without reliance on fixed-line access. 

• ATMs: Mobile connectivity provides fast, secure, redundant links for real-time processing. 

Expanding the conversation: More ways to connect the ‘things’ 

Beyond the essentials, Cellular IoT opens new possibilities across a range of sectors: 

• POS systems: Enable mobile, on-the-go payment processing 

• Intelligent vending machines & kiosks: Support real-time monitoring and stock tracking 

• Remote CCTV & security: Operate surveillance without the need for broadband 

• Environmental sensors: Track temperature, water levels or air quality remotely 

• Smart parking: Enable live availability updates and mobile payments 

• Digital signage: Push content updates in real-time 

• EV charging: Monitor usage, diagnostics, and payments remotely 

• Utility metering: Automate water, gas, and electric readings 

Why it matters for resellers 

Offering fixed and cellular connectivity allows you to build complete, tailored solutions and generate recurring revenue tied to your customers’ operational infrastructure. 

Cellular IoT offers a host of benefits to Channel partners and end customers, including:  

• Reliable: Multi-network SIMs with automatic failover 

• Cost-effective: No investment in cabling or on-site infrastructure 

• Flexible: Works where broadband doesn’t 

• Secure: With private APNs, firewalls, and static IPs 

• Sticky: The deeper the integration, the harder it is to rip out 

Smarter connectivity with Giacom 

At Giacom, we offer the whole portfolio for connectivity, from Ethernet, FTTP, and IP Voice to Cellular IoT, all delivered through a single platform with expert Channel support. 

Smart Mobile Data, our plug-and-play IoT solution, makes it easy for resellers to start. It’s designed to complement your existing services, open new revenue streams, and help your customers stay connected to the people and the things that matter most. 

Ready to offer solution-fit connectivity for every scenario? 

Let’s talk about how IoT can add value to your connectivity portfolio.