emnify IoT eSIM | emnify Documentation

emnify provides eSIMs that are built specifically for IoT solutions. The eSIMs come in different quality grades that are more durable than standard SIM. They can be updated over the air (OTA) using eSIM remote SIM provisioning technologies and come in different form factors.

emnify eSIMs have a multi-IMSI applet installed on the SIM. The multi-IMSI applet ensures that the best network and network partners are used based on your device location.

M2M eSIM

The emnify IoT eSIM is an machine-to-machine (M2M) eSIM compliant with SGP.01, SGP.02, and SGP.016. The M2M eSIM is also called an embedded universal integrated circuit card (eUICC). Unlike a regular SIM (UICC), an eUICC can be updated OTA. You can update M2M eSIMs with new configurations or profiles, eliminating the need for SIM swaps.

Form factors

emnify IoT eSIMs are available in the following form factors.

Form factor	Dimensions
2FF (Mini SIM)	15 x 25 x 0.75 mm
3FF (Micro SIM)	12 x 15 x 0.75 mm
4FF (Nano SIM)	8.8 x 12.3 x 0.75 mm
MFF2 (eSIM)	5 x 6 x 0.75 mm, 8 pin

MFF2 eSIMs can be soldered onto a device and aren’t readily removable.

Quality grades

emnify IoT eSIMs come in two different quality grades: Commercial eUICC and Industrial eUICC.

			Commercial eUICC	Industrial eUICC	MFF2
Hardware characteristics	Form Factor	Embedded/solderable	—	—	MFF2
	Form Factor	Removable Card	Triple-cut or Dual-Cut	2FF or 3FF	—
	Chip Type	Operational and storage temperature	-25°C to +85°C (JESD22-A104)	-40°C to +105°C (JESD22-A104)
		Operating voltage	1.62V to 5.5V
		Interface	ISO-7816, T=0
		Chipset NVM size	704 kilobytes
		Chipset RAM size	20 kilobytes
	NVRAM characteristics	Write Endurance	500k erase per page 10M cycles with OS High Endurance
		Data retention	15 years @85°C
		Moisture/Reflow conditions	—	MSL3 (J-STD020)
		Humidity	—	HA as per ETSI TS 102.671 / (JESD22-A101D)
		Corrosion	—	—	CX as per ETSI TS 102.671 (JESD22-A107)
		Vibration	—	—	VX as per ETSI TS 102.671 (JESD22-B103)
		Shock	—	—	SX as per ETSI TS 102.671 (JESD22-B104)
		Common Criteria Certificate	CCN-CC-5/2019

Compliance and software features

The following compliance standards and software features apply to all quality grades of emnify eSIMs.

emnify eUICC Compliance	GSMA	SGP.01 Embedded SIM Remote Provisioning Architecture	1.1
		SGP.02 Embedded UICC Technical Specification	3.2
		SGP.16 M2M Compliance Process	1.1
	TCA	eUICC Profile Package Interoperable Format Technical Specification	2.1
Software Features	Embedded Universal Integrated Circuit Card (eUICC)	Maximum number of profiles	10
		ISD-A and ISD-R system applets	Supported
		EAP-SIM and EAP-AKA authentication protocols	Supported
	LPWAN features	Suspend and resume SIM state ETSI TS 102 221 Poll Interval Negotiation ETSI TS 102 221	Supported
	OTA Capabilities on ISD-P: Remote file management - RFM Remote applet management - RAM	HTTPS	Supported
		TLS 1.2	Supported
		AES algorithm (128-bit, 192-bit, and 256-bit keys)	Supported
	GlobalPlatform	All Secure Channel Protocols	Supported
	Java Card	Standard Java Card APIs	Supported
	Java Card	GlobalPlatform API	Supported
Compliance		ROHS	Yes
Compliance		REACH	Yes

Multi-IMSI applet

emnify IoT eSIM cards are equipped with a multi-IMSI applet. This technology is similar to a mobile phone using dual-SIM technology or eSIM profiles in consumer phones. The main difference is that the emnify eSIM already includes cellular provider identities (IMSI) from multiple SIM cards and any network switching is done automatically.

The multi-IMSI applet on the eSIM uses a preferred IMSI list per country. This list defines the available IMSIs for that country and the order in which to try when connecting. If your device moves to a new country with a different preferred IMSI, the applet dynamically overwrites the previously active IMSI with the preferred one for this country.

The automatic switching by the multi-IMSI applet solves several connectivity challenges. For example:

In Brazil, a local Brazilian IMSI must be used to be legally compliant with regulations.
While emnify has over 400 direct roaming agreements, utilizing roaming agreements from partner operators (IMSI sponsors) provides you with even more coverage and better pricing.
The applet detects any issues with the preferred IMSI and automatically switches to a fallback IMSI to regain connection.