[q] imei corrupt after a reparation

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http://forum.xda-developers.com – Hello friends.... I have a problem. The port of my Galaxy S3 i9300 was damaged. I left the phone to a technician for change the port. Next, the technician delivery me the phone, but it have not a IMEI code... I dont know that ocurred. After, I went to other technician and he respond me that the phone had been overheated and this was the cause of the lost of IMEI. For the problem, Dont recognize the GSM network. Only this is the problem, all of rest is good. Sorry for my bad english. Please, helpme about what is the solution?. Thanks (HowTos)