---
title: "Insert SIM card"
slug: "insert-sim-card"
updated: 2025-08-18T09:37:06Z
published: 2025-08-18T11:49:29Z
canonical: "docs.calculus.group/insert-sim-card"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.calculus.group/llms.txt
> Use this file to discover all available pages before exploring further.

# Insert SIM card

## Instructions

The modem is at the top of the gateway under **Expansion 1**. When you look straight at the gateway, you will see the SIM card slot on the right side of the gateway.

![Back view of a device showing various ports and a highlighted connector.](https://cdn.document360.io/94d0a983-5058-4b02-8d06-1228a999a7a1/Images/Documentation/gateway_sim_card_slot.png?sv=2026-02-06&spr=https&st=2026-11-11T14%3A26%3A43Z&se=2026-11-11T15%3A26%3A43Z&sr=c&sp=r&sig=PV4UMDd3oX2ur7uHuJqAGN7Z1MwMd2w1jBwaRIZJu6A%3D)

Insert the new SIM card here.

> [!WARNING]
> Attention!
> 
> Make sure that the antennas are connected to the gateway before using it.