Why eSIM matters for M2M
A physical SIM ties a device to one supplier. Changing supplier, or changing network because coverage has moved, means sending someone to every device to swap the card. For a few routers that is inconvenient. For thousands of meters or chargepoints it can be impossible.
An eSIM, properly called an eUICC, holds one or more operator profiles and can download new ones over the air. The device owner can switch network or supplier remotely, which protects the investment in hardware for its full life.
The three eSIM standards
- SGP.02 is the original M2M architecture. It works, but profile changes are driven by the operators and switching supplier can be slow in practice.
- SGP.22 is the consumer standard used by phones and watches. It relies on a user scanning a QR code or using an app, so it is awkward for headless devices.
- SGP.32 is the newer IoT standard. It adds an eSIM IoT Manager, so the device owner can manage profiles across an estate without a screen or a user. Devices and platforms supporting SGP.32 are now reaching the market.
eSIM, multi-IMSI or multi network?
For UK sites that need resilience today, a multi network SIM is usually the simplest and most cost effective choice. For international estates on one contract, multi-IMSI works well. eSIM is the right choice when you need freedom to change supplier or operator over a long device life, or when devices are sealed and cannot take a physical SIM.
Fixed IP on an eSIM
A fixed IP belongs to the profile, not the chip. When a device runs one of our profiles it receives its fixed public or private address in the same way as a physical SIM. If you later switch to another supplier’s profile, the address will come from that supplier, so plan your firewall rules and VPNs accordingly.
Questions we are often asked
Can I put an eSIM in my existing router?
Only if the router has an eSIM chip or accepts an eSIM capable card. Many new routers and modules include one. Ask us about your model.
Is eSIM more secure than a physical SIM?
An embedded chip cannot be removed and used elsewhere, which reduces SIM theft. Security of the connection itself is the same as a physical SIM.
What is SGP.32?
The GSMA standard for remote SIM provisioning on IoT devices. It lets the device owner manage profiles across an estate without a user or screen on each device.