> For the complete documentation index, see [llms.txt](https://docs.monogoto.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.monogoto.io/getting-started/sim-cards/embedded-sims/embedded-sim-mff4.md).

# Embedded SIM (MFF4)

<div align="left"><figure><img src="/files/QaMPlflmjIb7SMlyHIXm" alt="" width="563"><figcaption></figcaption></figure></div>

## Description

**MFF4 embedded** SIMs deliver the same global cellular connectivity as MFF2 in an ultra-compact, soldered package. At just 2 × 2 mm, MFF4 is the smallest discrete eUICC form factor available, freeing up valuable PCB space for sensors, batteries and radios. It is the perfect choice for size-constrained IoT devices such as wearables, asset trackers, e-bikes and compact gateways, including devices that move between cities and countries or are deployed in remote environments. We offer flexible pricing which you can check out by [<mark style="color:blue;">following this link</mark>](https://monogoto.io/iot-pricing-page/).

## Features

* Management of your embedded SIM via a cloud-based self-service platform.
* Support of [Monogoto Toolkit (MTK)](/getting-started/monogotos-sim-tool-kit-mtk.md). This is a feature to manage multiple IMSI profiles for enhanced connectivity and roaming optimization for a SIM.
* Monogoto secure IoT SIM works on 550+ cellular networks in 180 countries offering all network technologies. You can check our coverage by [following this link](/getting-started/identity-b-coverage.md).
* With the use of API, integrate 3rd party cloud applications and automate processes across your organization.
* Cloud-based private network with hybrid local-breakout. Radio and CPE agnostic solution supports CBRS and any band.

## Technical Specifications

Technical Specifications

| Form Factor                    | MFF4                                                  |
| ------------------------------ | ----------------------------------------------------- |
| Pin configuration              | [USON8](https://www.infineon.com/package/PG-USON-8-6) |
| Size (mm)                      | 2 x 2 x 0.55                                          |
| Supported network technologies | 2G/3G/4G/LTE-M/NB-iot                                 |
| Operating temperatures         | -40°C to 105°C                                        |
| Expected lifetime              | 15 years at 85°C                                      |
| Read/Write Cycles              | 500 000                                               |

More information about the embedded SIMs can be found by downloading the below-mentioned file and inspecting information about industrial embedded SIM.

{% file src="/files/UJb01MrCPd94oaO07c66" %}

### Embedded MFF4 SIM in functions

<figure><img src="/files/pt5c7e8gIc69FuLZA2nT" alt=""><figcaption></figcaption></figure>

## MFF4 packaging

MFF4 uses the 8-pin no-leads USON-8-6 package (2 × 2 mm). Full mechanical drawings and package dimensions are available on the manufacturer's page: [Infineon PG-USON-8-6](https://www.infineon.com/package/PG-USON-8-6).

<figure><img src="/files/YkrP6fzAzMSJTx4blMkl" alt=""><figcaption></figcaption></figure>

## What is ICCID and where to find it?

ICCID stands for Integrated Circuit Card ID. This is a globally unique identification number for the SIM itself. ICCID number consists of 19 or 20 digits and is printed on the back of the embedded SIM. You can read more about this in our published article [<mark style="color:blue;">following this link</mark>](https://monogoto.io/2022/07/18/what-is-an-iccid-number-the-complete-iot-sim-card-dictionary/).

### Checking physical embedded SIM

ICCID on Embedded Monogoto SIM can be found on the embedded SIM chip itself.

<figure><img src="/files/b6hOFFoO1Jn6qxHtdEtu" alt=""><figcaption></figcaption></figure>

### Using AT commands

If your device supports the use of AT commands, then you can also check the ICCID by using an AT command.

| Device Manufacturer  | AT Command |
| -------------------- | ---------- |
| U-blox               | AT+CCID    |
| SIMCom               | AT+CCID    |
| Nordic Semiconductor | AT%XICCID  |
| Telit                | AT#CCID    |
| Quectel              | AT+QCCID   |
| Cinterion            | AT+CCID    |
| Murata               | AT%CCID    |

{% hint style="info" %}
Please note that the mentioned AT Commands may differ based on the used device model, even when using the same device manufacturer, so it is always a good idea to check the device manual to see what exact command you should use.
{% endhint %}