Unlocking codes for Samsung S7 ordered 10pm, received 9am - excellent speed, informed during the process by both SMS messages and emails. Codes worked for the first time even though my phone was blocked before and was saying: SIM network PIN blocked. Enter SIM network PUK. Both MCK and NCK codes were needed! Not 5 stars because I consider 20 GBP too high price for sending two 8 digit numbers by email. Not sure if they have to pay part of it to Samsung or the network operator, but I assume not, these unlocking numbers are just generated based on the phone IMEI.