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i am an iphone technican and i’m stuck with one iphone 6 *#06# no imei but in the settings/general/about the imei is there iphone has no sound at all just with headphones restart randomly any pro here to tell me what i have to do with this phone i do micro-soldering to but i don’t know what to do in this phone

I think you have to go back to basics here… Do a good visual inspection (under magnification) to look for obvious issuesLook carefully at the SIM card readerTry a different SIM card (do you have the right network)Start probing your main voltage lines, focus on the PMIC, RF PMIC and all of the LDO’s Something will come up and then focus your effort from there. Get back to us with your findings and me can maybe help you out.