As the name of the service can suggest, with the Read Cert you save certificate data. What is this Cert file? Basically, this is a digital data that gets connected to the given phone during manufacturing and it also gets signed by the manufacturer this is the so-called Certificate. This certificate includes, among others, a certain data of the IMEI and, in case of new models, an ID code of the given phone to prevent the re-use of the certificate in a different phone. Practically, this makes it impossible to clone an IMEI number. This certificate cannot be reproduced since solely the manufacturer owns the private key to create it. Which makes the Read Cert essential for most of our users.