A call cannot be made and the phone’s status is ‘not registered to network’ so practically, the phone cannot be used at all.When dialing *#0011#, the IMEI status is NG and the network data are all wrong.The IMEI number consists of only zeros: 000000000000000.The most common errors that might suggest such a problem with the phone are the following: Thus, the phone is worthless at that point. What is important here is when the IMEI or the digital signature is damaged, the phone is not working and even Samsung service centers cannot repair the broken phone. We do not want to go into details on how an IMEI or certificate can get damaged but the damage is mostly caused by an intervention of a software or flash error. This system is quite secure up to the point when the IMEI or the certificate is damaged. Conclusively, the input of the IMEI or other certificates is not enough since the modem will not accept it. The integrity of the modem is controlled by other peripheries at lower levels. The certificate is being checked by the modem. This certificate cannot be reproduced since solely the manufacturer owns the private key to create it. Practically, this make it impossible to clone an IMEI number. 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. 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). To answer these questions, here is some streamlined background information about how the phones work software-wise.Ĭommon knowledge that every phone has a serial number (IMEI). The first reasonable question is why IMEI repair or Patch CERT functions are needed?
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