OT trial automatic switch to monthly

Author: yoninalmsft

articles/defender-for-iot/organizations/billing.md

@@ -16,6 +16,8 @@ If you would like to evaluate Defender for IoT, you can use a trial commitment f
 
 - **For OT networks**, use a trial to deploy one or more Defender for IoT sensors on your network to monitor traffic, analyze data, generate alerts, learn about network risks and vulnerabilities, and more. An OT trial supports 1,000 [committed devices](#defender-for-iot-committed-devices), which are the number of devices you want to monitor in your network.
 
+    The trial for OT networks is free of charge for the first 30 days. Any usage beyond 30 days will incur a charge based on the monthly plan for 1,000 devices. For more information, see [the Microsoft Defender for IoT pricing page](https://azure.microsoft.com/pricing/details/iot-defender/).
+
 - **For Enterprise IoT networks**, use a trial to view alerts, recommendations, and vulnerabilities in Microsoft 365. An Enterprise IoT trial is not limited to a specific number of devices.
 
 ## Defender for IoT committed devices

articles/defender-for-iot/organizations/how-to-manage-subscriptions.md

@@ -62,9 +62,7 @@ This procedure describes how to add a Defender for IoT plan for OT networks to a
 
      - **Price plan**. Select a monthly or annual commitment, or a [trial](billing.md#free-trial).
 
-        Microsoft Defender for IoT provides a 30-day free trial for the first 1,000 committed devices for evaluation purposes.
-
-        For more information, see the [Microsoft Defender for IoT pricing page](https://azure.microsoft.com/pricing/details/iot-defender/).
+        Microsoft Defender for IoT provides a 30-day free trial for the first 1,000 committed devices for evaluation purposes. Any usage beyond 30 days will incur a charge based on the monthly plan for 1,000 devices. For more information, see [the Microsoft Defender for IoT pricing page](https://azure.microsoft.com/pricing/details/iot-defender/).
 
     - **Committed sites**. Relevant for annual commitments only. Enter the number of committed sites.