Go to 'Manage Connections'
Click on 'Turn All Connections Off'
Go to 'Options'
Click on 'Status'
Go back to 'Options'
Click on 'Advanced Options'
Click on 'SIM Card'
Type 'MEPD' (letters will not appear on-screen but a menu will pop up)
Type 'MEP2' (user will be prompted to enter MEP code)
Enter the unlock code
Reboot device
Go to 'Manage Connections'
Click on 'Restore Connections'
Device is now unlocked
Please note when entering MEPD, ETC. You need to use caps.