How to Completely Disable ‘Phone Calls Access’ via Group Policy in Windows 11

Windows 11 includes a robust, OS-level permissions architecture designed to broker application access to the system’s telecommunication subsystem. The “Phone Calls Access” API allows third-party UWP (Universal Windows Platform) and modern Windows apps to initiate, monitor, or manage cellular or VoIP phone calls directly from the desktop. While useful for unified communication dashboards or smartphone companion apps (like Microsoft’s Phone Link), unfettered access to telephony APIs represents a catastrophic operational security (OPSEC) and financial liability in highly restricted enterprise, government, or military environments. A compromised application could silently initiate toll calls, monitor dial strings (DTMF tones), or intercept incoming communication streams, creating a massive vector for unauthorized tracking and financial abuse.

This guide explains how to completely disable ‘Phone Calls Access’ via Group Policy in Windows 11, enforcing a strict, system-wide block that prevents any application from reading, initiating, or interacting with the OS telecommunication broker.

Disable Phone Calls Access via Group Policy

To enforce a strict configuration that explicitly strips the OS of its ability to broker telephony access to third-party applications and overrides any user-defined privacy settings in the modern Settings app, we must deploy an administrative template. Note that this requires Windows 11 Pro, Enterprise, or Education editions.

1. Log into Windows 11 with an Administrator account.
2. Press the Windows Key + R to open the Run dialogue box.
3. Type gpedit.msc and press Enter to launch the Local Group Policy Editor.
4. In the left-hand navigation pane, strictly follow this exact path:

   Computer Configuration > Administrative Templates > Windows Components > App Privacy

5. In the right-hand pane, locate the policy named Let Windows apps make phone calls.
6. Double-click the policy to open its configuration window.
7. Select the radio button next to Enabled.
8. Under the Options section, locate the dropdown menu labeled “Default for all apps”.
9. Explicitly select Force Deny from the list. (By explicitly setting this to Force Deny, we instruct the Windows API broker to proactively intercept and reject any process attempting to hook into the local cellular/VoIP dialer, overriding user preference and ensuring a cryptographic block on unmanaged telecommunications).
10. Click Apply, then click OK.

Verify the Configuration Lockdown

Group Policy changes modifying core OS privacy APIs require the operating system to update its local security policy state.

Open Command Prompt as Administrator and run gpupdate /force. To verify the restriction is actively enforced, launch the Windows 11 Settings app and navigate to Privacy & security > Phone calls (under App permissions). You will immediately notice that the master toggle for allowing apps to make phone calls is completely greyed out and locked in the “Off” position. At the top of the window, a red or yellow banner will prominently declare, “Some of these settings are managed by your organization.” Furthermore, launching any third-party communication application that previously relied on initiating system-level calls will result in immediate API failures or prompts stating that access has been administratively revoked, confirming total OPSEC compliance.