> For the complete documentation index, see [llms.txt](https://ask.simplehw.eu/kb/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ask.simplehw.eu/kb/simple-api-6-generation/overview/device-list/checkfox/all-you-need-to-know-about-the-sim-card-in-your-checkfox-and-gsm-connectivity.md).

# All You Need to Know About the SIM Card in Your CheckFox and GSM connectivity

## Provided connectivity

Checkfox 1.0 was shipped with 2 years of Sigfox connectivity and no SIM card. CheckFox 2.0 is shipped with no Sigfox connectivity and a Global rechargeable SIM card. Find the registration guide below.

## Activating the SIM card that comes with your CheckFox 2.0

With Checkfox, you receive a 10 EUR prepaid worldwide SIM card that is already inserted in the device. To activate the SIM card and for the data costs, please go to [thingsmobile.com](https://www.thingsmobile.com/), create an account and register your SIM for the **pay-per-use plan**.

The device does not use up a lot of data so the prepaid SIM card should last a while, but in case you need to recharge it, you can do it in this account too. Or you can use your own data SIM card, of course, just make sure to change the APN settings accordingly.

### Here are screenshots taken step-by-step during the activation:

![SIM card activation](/files/ms2K4DpM5iYInt9VhnR9)

![SIM card activation](/files/9MIhE1qFE5wCHIJSFzzo)

![SIM card activation](/files/N2fwgHa5mZlgvxbYjfyr)

![SIM card activation](/files/STse4O2qKYhMyNJNcW7u)

![SIM card activation](/files/b2g0ogf9ataRnhgH3G39)

## How to use your own SIM card with the CheckFox

**SIM card requirement:**

* Mini-sized SIM (most common SIM card type with the dimensions of 15x25mm)
* Unlocked PIN

You can **insert** the SIM card if you unscrew the device and open it.

## Supported technologies

The CheckFox device supports **3G/Edge GSM** at these frequencies:

* @UMTS 800/850/900/1900/2100 MHz
* @GSM 850/900/1800/1900MHz

LTE is **not** supported.

{% hint style="info" %}
The [Quectel UG96 modem](http://www.quectel.com/UploadFile/Product/Quectel_UG96_UMTS\&HSPA_Specification_V1.3.pdf) is used in the device. The data transferred via GSM is one hundred bytes per measurement plus overhead, so you don’t need huge data plans. If you do 1000 measurements per month you need a 1MB data plan. If need the **IMEI number** of the 3G module, it can be found in **Service Menu - About**. IMEI is 15 characters long.
{% endhint %}