I'm trying to unlock an iPhone that was previously tied to a corporate account that I don't have access to. It was a device I purchased that was tied to my work's ATT plan. I recently upgraded the work phone and deactivated the old one from the corporate plan. I'd like to unlock the older phone so that it can be used with another carrier. But when I submitted the IMEI number AT&T gave me the following response:
"Hmm...looks like there's an unpaid balance linked to your device, so we can't unlock it."
My employer is unwilling to help me unlock the device, despite the fact that I own it. Is there another way I can unlock it?