Originally Posted by ndoshi1
I have since left the company so I no longer want to be under the corporate IT policy. I also think my phone is locked because when I insert a new non T-mobile SIM card, it says "Invalid SIM Card". However, when I go to Advanced Options/SIM Card, it says security disabled. I am not sure what this means. i.e. if my phone is locked or unlocked because these two conditions seem contradictory.
SIM Card subsidy locks don't show up as SIM security. You need to go Options->Advanced->SIM Card. When in the menu, type "MEPPD" and a new section of menu will appear. If any of the items under Personalisation are "Enabled," that means it's locked. Typically, it's the Network that is enabled. T-Mobile can give you the unlock code.
As far as erasing the device, you can follow the directions in AfterWord's post. But, that won't remove the IT policy that has been installed. There's a sticky post here
that can help you with that. Good luck.