# Trusted MSISDN

Trusted [Mobile Station Integrated Services Digital Network (MSISDN)](https://www.infobip.com/glossary/msisdn) is a list of MSISDNs that Signals will unconditionally trust as safe, i.e., messages sent towards those destinations will not be blocked.
  
You can manage a trusted MSISDN list through [public API](https://www.infobip.com/docs/api/platform/signals) or the **web interface**.
  
To create your list of trusted numbers, log into your account, and navigate to **Signals → Trusted numbers**.

The **Import File** button allows you to import a list of trusted numbers that contains phone numbers in MSISDN or international format, which will be validated before they are added to the trusted list. You can upload up to 1,000,000 numbers in a .csv or .txt file format by dragging and dropping your file or by clicking the **Browse** button to upload it. Once you upload the file, click the **Continue** button.
  
which will be validated before they are added to the trusted list. Once you add the numbers, click the **Continue** button.

Using the **Search** bar, you can find a specific number in your list. Click the trash bin icon to **delete** a number from your list.