Group policy to block connecting mobile device through USB


I am able to block usb storage device using group policy in windows 2008, but still users can connect their mobile and system shows the  mobile drive. How to disable this also
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SandeshdubeySenior Server EngineerCommented:
Ensure that GPO is applied correctly

GPO Name
Removable Disks: Deny read access               Enabled      
Removable Disks: Deny write access      Enabled      
All Removable Storage classes: Deny all access      Enabled      
WPD Devices: Deny read access      Enabled      USB
WPD Devices: Deny write access      Enabled      USB

Note: user may connect the mobile device for charging but they cannot copy the data from mobile to computer and viceversa

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