USSD protocol sample

Shows how to use the USSD protocol with GSM-capable mobile broadband adapters. USSD is typically used for account management of a mobile broadband subscription. USSD messages are specific to the mobile broadband operator and must be choosen accordingly when used in a live network.

Note: This sample is part of a large collection of UWP feature samples. You can download this sample as a standalone ZIP file from, or you can download the entire collection as a single ZIP file, but be sure to unzip everything to access shared dependencies. For more info on working with the ZIP file, the samples collection, and GitHub, see Get the UWP samples from GitHub. For more samples, see the Samples portal on the Windows Dev Center.


This sample accesses privileged APIs used by mobile broadband operators. Hence it requires a special-use capability to be declared in package manifest.


  • This sample will not pass WACK because it uses a special-use capability.
  • The USSD API is present but nonfunctional on Phone devices.


USSD API reference

System requirements

Hardware: PC with mobile broadband modem

Client: Windows 10

Phone: Not supported

Build the sample

  1. If you download the samples ZIP, be sure to unzip the entire archive, not just the folder with the sample you want to build.
  2. Start Microsoft Visual Studio and select File > Open > Project/Solution.
  3. Starting in the folder where you unzipped the samples, go to the Samples subfolder, then the subfolder for this specific sample, then the subfolder for your preferred language (C++, C#, or JavaScript). Double-click the Visual Studio Solution (.sln) file.
  4. Press Ctrl+Shift+B, or select Build > Build Solution.

Run the sample

The next steps depend on whether you just want to deploy the sample or you want to both deploy and run it.

Deploying the sample

  • Select Build > Deploy Solution.

Deploying and running the sample

  • To debug the sample and then run it, press F5 or select Debug > Start Debugging. To run the sample without debugging, press Ctrl+F5 or selectDebug > Start Without Debugging.