Quick Answer
LTE450 networks use standard SIM cards for device authentication, but the SIMs must be provisioned by the private LTE450 network operator – not a public mobile operator. Industrial MFF2 (soldered) SIMs are recommended for harsh environments. eSIM (eUICC) technology using the SGP.32 standard enables remote SIM provisioning for large LTE450 device fleets, eliminating the need to physically visit each device to change network profiles.
SIM Cards in LTE450 Networks
Every device connecting to an LTE450 network requires a SIM card (Subscriber Identity Module) provisioned by that network’s operator. The SIM stores the International Mobile Subscriber Identity (IMSI), the Authentication Key (Ki) used in 3GPP AKA authentication, and optionally an Access Point Name (APN) configuration for the private network. Without a correctly provisioned SIM, a device will be unable to attach to the LTE450 network, regardless of its hardware band support.
For private LTE450 utility networks, the network operator maintains the Home Subscriber Server (HSS) which holds subscriber records for every SIM deployed in the network. When a device attempts to attach, the eNodeB requests authentication from the HSS, which uses the Ki to generate authentication vectors. This mutual authentication process ensures that only authorised devices can connect, and that the network is genuine.
Industrial SIM Form Factors
Standard removable SIM cards (2FF “mini-SIM”, 3FF “micro-SIM”, 4FF “nano-SIM”) are designed for consumer electronics and are not suitable for utility field equipment exposed to vibration, temperature extremes, humidity and the risk of tampering. The recommended form factor for utility LTE450 deployments is MFF2 (Machine Form Factor 2), a soldered SIM chip that is physically bonded to the PCB during manufacture. MFF2 SIMs are rated to industrial temperature ranges (-40°C to +105°C), have no socket that can corrode or dislodge, and cannot be physically removed from the device.
eSIM and eUICC for LTE450 Fleets
Embedded Universal Integrated Circuit Card (eUICC) technology – commonly known as eSIM – transforms SIM management for large device deployments. Rather than containing a single operator profile permanently, an eUICC can store multiple profiles and switch between them over-the-air (OTA) using the Remote SIM Provisioning (RSP) protocols defined by the GSMA.
For LTE450 utility networks deploying thousands or tens of thousands of devices, eUICC provides significant operational advantages: initial devices can be provisioned with a bootstrap profile, then remotely switched to the private LTE450 operator profile once deployed; devices can be migrated between operators without physical access; and replacement devices can be remotely provisioned rather than requiring engineer visits. The SGP.32 standard specifically addresses IoT eSIM management for scenarios with constrained devices – directly relevant to smart meter and remote monitoring applications on LTE450 networks.
For comprehensive technical coverage of eUICC and SGP.32, the dedicated reference site euicc.co.uk provides in-depth technical documentation.
Frequently Asked Questions
No. The SIM must be provisioned on the private LTE450 network’s HSS. A public operator SIM (e.g. from EE, Vodafone, O2) is registered with that operator’s HSS and will be rejected by a private LTE450 network. The private LTE450 operator provides SIMs or eSIM profiles that are registered on their own HSS.
An Access Point Name (APN) defines the gateway a device uses to connect to external networks. A private APN routes all device traffic through the utility’s own secure network, rather than through the public internet. This keeps operational technology (OT) traffic isolated from external threats. Private APNs can also enforce QoS policies and enable traffic monitoring. The APN is configured in the SIM profile or in the device’s network settings.
SGP.32 is the GSMA’s IoT-specific eSIM management standard. Unlike SGP.02 (M2M) and SGP.22 (consumer), SGP.32 is designed for resource-constrained devices that may not always be online. A device can receive profile management commands during its periodic connection windows, even if it spends most of its time in low-power sleep mode. This is ideal for LTE-M devices in smart metering applications that connect briefly every few hours to upload data.