When we think of connected devices, our thoughts tend to turn to phones, mobiles, computers and tablets. However, the Internet of Things (IoT) has made connectable devices out of almost everything, from self-driving tractors to everyday appliances like refrigerators. It’s already transforming our lives, homes and businesses and the possibilities seem endless.

What is it?

IoT is a network of objects embedded with technology that can receive or send a signal and communicate with each other. They can be connected by wires or wirelessly through Wi-Fi, Bluetooth or a cellular network with mobile data. Going wireless removes a lot of the hassle in implementing an IoT network. The mobile data route can also be as simple as inserting a SIM into a device you’d like to connect (provided the device is compatible). Cellular can also offer comprehensive coverage, high bandwidth and, once 5G becomes more prominent, incredibly fast speeds.

But what can be connected with an IoT SIM? More than you think! The following are only a handful of devices ready to make the most of SIM technology. Many of them also traditionally sit on PSTN lines meaning once the network is switched off, they’ll cease to work unless they’re migrated to another type of connectivity.

Card readers


Card readers used to rely on analogue lines to transmit data. Now, IoT SIMs allow card readers to work securely and wirelessly as connected devices. This is especially handy as it means they can be used throughout your premises or in different locations such as pop-up stores or at special events. They can also be used by plumbers, electricians, taxi drivers and more to take card payments from customers.

Entry systems


Door buzzers, intercoms, access controls, security barriers – all of them can be connected devices with an IoT SIM. Compared to hardwired solutions, using SIMs can be extremely beneficial when entry systems need to be connected over significant distances and it allows for easier remote access and control.

Security cameras


IoT SIMs can provide a secure, wireless connection for CCTV cameras. It’s a great alternative in rural areas or any premises where installing wires would cause a lot of disruption. For battery or solar-powered cameras, the wireless connection allows the cameras to be placed almost anywhere and be used right away.

Lift lines


Since 1999, all passenger lifts in the UK are required to have alarms that connect passengers to rescue services through an emergency phone line. Many of these still use analogue hardware, which will soon need replacing. SIMs offer a reliable alternative to keep lift alarms connected and can be battery-backed in case of power outages.



More than one million alarm systems in the UK are still connected to the PSTN according to Openreach. IoT SIMs will keep systems working and your business safe past 2025.

There’s a lot you can do with a SIM card. Using them in IoT networks not only makes for a reliable alternative to wired connections; it’s the way forward. As technology continues to evolve, the benefits of connecting devices via SIM are sure to strengthen.

Get connected devices anywhere

Daisy Anywhere is a new way of thinking about connectivity. The difference? It runs on cellular data. The multi-network SIMs provide a flexible solution to keep businesses and their customers connected. Whether you’re connecting thousands of devices on an IoT network or setting up a temporary event with Wi-Fi, Daisy Anywhere is reliable, unsteered and available… anywhere.

Key features:

  • SIMs automatically connect to the strongest signal available.
  • Covered by 650 networks across 180 countries.
  • Flexible tariffs and bespoke data tiers alongside a managed real-time usage portal means you can easily avoid overage.
  • Connect multiple devices, offices, or events with one pool of data, so you don’t need to worry about separate usage caps.

Your next move to All IP

To better understand what products will be retiring with the PSTN Switch Off and what solutions will be replacing them, please download our new, completely free, Journey to All IP magazine.