# OmniSIM - GSMA Test Profile (TS.48)

{% hint style="info" %}
This documentation applies to the following products:

* OmniSIM

For all other products, please review their respective documentation
{% endhint %}

## Overview

OmniSIM comes with a GSMA Test Profile (TS.48 - Generic eUICC Test Profile for Device Testing).

The Test profile is disabled by default and is not referenced in CPro or the SM-DP (RSP).

OmniSIM Test profile is aligned with TS.48 v4.x

<https://www.gsma.com/newsroom/wp-content/uploads/TS.48-v4.0.pdf>

The Test Profile can be Enabled and Disabled by sending an APDU to the SIM with a CSIM AT Command.

{% hint style="warning" %}
Please note that although KORE has a Test Profile on OmniSIM it is not supported and we assume the user has knowledge of how to use the TS.48 Test Profile with their device.
{% endhint %}

## Enable the Test Profile <a href="#enable-the-test-profile" id="enable-the-test-profile"></a>

The following AT command can be used to send the APDU to instruct the card to switch to the TS.48 Test profile.

{% code title="Switch to TS.48 Profile" %}

```
AT+CSIM=16,"80C2000003E40102"
```

{% endcode %}

{% code title="Response" %}

```
+CSIM: 4,"6103"
OK
```

{% endcode %}

{% hint style="info" %}
The device will lose connectivity and possibly reset. The Test Profile will be enabled
{% endhint %}

## Disable the Test Profile

The following AT command can be used to send the APDU to instruct the card to switch from to the last enabled KORE profile.

{% code title="Switch back to KORE" %}

```
AT+CSIM=16,"80C2000003E40103"
```

{% endcode %}

{% code title="Response" %}

```
+CSIM: 4,"6103"
OK
```

{% endcode %}

{% hint style="info" %}
The device will roll-back to the KORE profile and reconnect to the cellular network.
{% endhint %}


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