Can I use the UnlockMySIM card if my iPhone has been blacklisted?

You will be unable to use your iPhone on the network of your choice using the UnlockMySIM card if the device has been blacklisted. 

When a cell phone has been reported by the original operator due to loss, theft or because the owner has pending bills, it will almost certainly not work on any network in the country of origin. There is a possibility it may work abroad but doctorSIM cannot guarantee it and will not be held liable if not the case.

The only way to remove a phone from the blacklist is by contacting the network that reported it in the first place. doctorSIM cannot provide this service and does not issue refunds if the phone is successfully network unlocked but doesn't work properly on the chosen network.