This is a big scam, they advertise $28 for sim unlock, I paid using my CC and my bank declined the transaction twice and called me to confirm and I said ok, I called T mobile and they assured me that my phone is not blacklisted neither blocked, no contract and is paid in full.
After paying $28,2 days later I received an email from Doctorunlock.net asking me to pay an additional 62.99 english pound which is like $88 but I refused and asked for refund but they refused, may they spend every penny at the hospitals and doctors for incurable diseases and may God curse them all, their place in hell fire is awaiting them
Today, 7/25/2019, I received my refund back after numerous emails back and forth