# SIM

A `SIM (Subscriber Identity Module)` represents a SIM card used in mobile equipment such as telephones, tablets, 4G/5G modems, etc. You can manage these SIM cards as specific objects to track their use and allocation.

{% hint style="success" %}
Note that if you modify a field manually, it will be considered locked. This will prevent it from being modified the next time the automatic inventory is uploaded.

For more information, see [lock](https://github.com/glpi-network/gitbook/blob/main/manual/modules/assets/broken-reference/README.md)
{% endhint %}

In a display form, the following information is available:

![Detail view SIM](/files/wdkFO9x5D9R1coeEdZx4)

* Code PIN
* Code PIN2
* Code PUK
* Code PUK2
* [Line](/documentation/modules/management/lines.md)
* Mobile Subscriber Identification Number (MSIN is last 8 or 10 digits of IMSI)
* [Serial number](/documentation/tabs/common_fields/serial_number.md)
* [Inventory number](/documentation/tabs/common_fields/inventory_number.md)
* [Location](/documentation/tabs/common_fields/location.md)
* [Status](/documentation/tabs/common_fields/status.md)
* [User](/documentation/tabs/common_fields/user.md)
* [Group](/documentation/tabs/common_fields/group.md)
* [Comments](/documentation/tabs/common_fields/comments.md)

## Management

[Management](/documentation/modules/tabs/management.md) of financial and administrative information, this information is visible in the 'Management' tab on the current item's form.

## Documents

The [document](/documentation/modules/management/documents.md) tab lets you link different types of files to this item (PDF, txt, png, etc.) You can attach a document already uploaded to GLPI or add a new one directly from this tab.

## Locks

[Locks](https://github.com/glpi-network/gitbook/blob/main/manual/modules/assets/broken-reference/README.md) are used to prevent a field from being modified when the inventory is uploaded. You can lock/unlock the fields you wish in a GLPI object.

## Contracts

GLPI supports [contracts](/documentation/modules/management/contract.md) management, in order to manage contract types such as loan, maintenance, support...

Contracts management allows to:

* make an inventory of all contracts related to the organization assets
* integrate contracts in GLPI financial management
* anticipate and follow contract renewal.

## History

The *History* tab is used to show any changes made to an item. The following information about the changes is available:

* ID of the change.
* Date and time the change was made.
* User who made the change. If this field is not filled, it means that the action was done automatically (For example: automatic inventory update).
* Field that was changed.
* Description of the change that was made.

The description of the change represents either the difference between the old and the new value (For example with location field: Change HQ to Remote Office A), or the explanation of the action which was carried out (For example: Uninstallation of a software: "Gimp 2.0").

{% hint style="info" %}
For dropdowns or objects with a parent/child relationship, the modification of a child will appear in the history of the parent element.
{% endhint %}

## All Information

For an item, all information is displayed on one page from the *All* tab. This shows all of the tabs of an object's form in one view, one below the other.


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://help.glpi-project.org/documentation/modules/assets/sim.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.