# Understanding OPLMN and FPLMN on the Thing details page

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Applicaple for SIMs with [MTK](/getting-started/monogotos-sim-tool-kit-mtk.md) installed.
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On the Things page in the Monogoto Hub, you will see the terms “OPLMN" (Preferred Networks) and “FPLMN" (Forbidden Networks). These terms refer to network preference settings stored on the SIM card, determining which networks the SIM will prioritize or avoid.

### What is OPLMN? 

The Operator Preferred Public Land Mobile Network (OPLMN) List is a file stored on a SIM card. It contains a prioritized list of mobile networks preferred by the home network provider. When roaming, the SIM will attempt to connect to these networks first to ensure better coverage and service quality.

### What is FPLMN? 

The Forbidden Public Land Mobile Network (FPLMN) List is a SIM file that keeps track of networks the device should not attempt to connect to. A network may be added to this list if a connection attempt fails due to rejection by the network or compatibility issues with the subscriber’s plan.

* The Monogoto Hub only displays FPLMN carriers that come pre-configured or are sent via campaigns.
* Devices can manually add a network to the FPLMN list, but this must be checked directly on the device using an AT command. Check our [AT Command Guide](/university/at-commands.md) for more details.

<figure><img src="/files/2uResi6CgmmZjQjM6ls4" alt=""><figcaption></figcaption></figure>

Monogoto SIMs come with specific networks already assigned to the OPLMN/FPLMN lists, based on the mobile identity. Our support team can customize these lists through OTA campaigns, which will be reflected in the Monogoto Hub.

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