---
title: "Working with SIM cards and SMS"
slug: "working-with-sim-cards-and-sms"
tags: ["SiteManager", "3G/4G"]
updated: 2025-09-10T14:22:53Z
published: 2025-09-10T14:22:53Z
canonical: "kb.secomea.com/working-with-sim-cards-and-sms"
---

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

# Working with SIM cards and SMS

This article will give you detailed information on how to set up and use a SiteManager with SIM cards.

#### SIM Card Requirements.

The SIM card needs to be the correct size Micro-SIM (3FF) (This size is also known as "Standard Size") and needs to support PPP

![](https://cdn.document360.io/88f49507-a7a0-4636-b297-13c4d0065310/Images/Documentation/image-1757511412638.png)

#### SIM Card installation.

You will need to insert the SIM card into the SIM slot at the top of the SiteManager as shown in the picture below.

![](https://cdn.document360.io/88f49507-a7a0-4636-b297-13c4d0065310/Images/Documentation/image-1757512819668.png)

Make sure that the SIM card is inserted 100% into the SiteManager. An audible click will appear when the SIM card is inserted correctly and the SIM card will flush with the top of the SiteManager.

#### SIM Card setup.

You will need to reboot the SiteManager after the installation of the SIM card in the SiteManager. This must be done each time a SIM card is inserted into a SiteManager.

In some cases, you will need to configure a SIM PIN code (4) or an APN (3) on the SiteManager. This can be accomplished from the menu "System > Uplink2"

![](https://cdn.document360.io/88f49507-a7a0-4636-b297-13c4d0065310/Images/Documentation/image-1757513014944.png)

It can also be configured from a USB device. Please see the following article for more information: [Create USB configuration](/v1/docs/how-to-create-a-usb-configuration)

#### SMS only

To configure a SiteManager only to receive and send text messages from the menu "System > Uplink2" under "Mode". When this is activated, you will not be able to reach the internet using the Uplink2 port.

#### SMS Wakeup

SMS Wakeup is a setting that allows you to "disable" a SiteManager until it receives a text message with a passphrase that enables it. This is useful if you want to save on Idle data that SiteManager uses (For more information about data usage, please see: [Idle data usage](/v1/docs/sitemanager-bandwidth)) or you want to control when users can access a device.

You can enable SMS wakeup from "System > Uplink2" under "Mode" For a deeper explanation on how to set up SMS wakeup and how to use it please see: [Using SMS-Wakeup.](/v1/docs/using-sitemanager-sms-wakeup)

## Related

- [How to create a USB configuration](/how-to-create-a-usb-configuration.md)
- [SiteManager Bandwidth](/sitemanager-bandwidth.md)
- [Using SiteManager SMS-Wakeup](/using-sitemanager-sms-wakeup.md)