Ref: Unlock at & t samsung jack secrrity,installed 3rd part apps on locked AT & T jack.;.
post here shows a video about how to remove the security limitations and enable registry edits. After the registry is unlocked, a component is removed which will enable the AT&T MEdia Net Internet Sharing capabilities.
The first step of removing the security limitations is to download the ClearSecurity file.
• Next, connect the Samsung Jack to the computer and move the file to the device through ActiveSync.
• Install ClearSecurity and launch Microsoft’s Security Configuration Manager.
• Select Security Off from the drop down menu and click the Provision button, the program will install a file called Tool.
• Run a registry editor program like Total Commander or Mobile Registry Editor and delete the file ForceCellConnection from: HKEY_LOCAL_MACHINE>Comm>InternetSharing>Settings.