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Morning Aaron Everyday is a school day 😁 Never come across this before so time for some home schooling It appears that there is no physical sim card instead there is a soft sim (software based) so you can't just remove the sim. I am assuming all other functions are operating normally? Do you have access to a BMW Diagnostic suite ? Something like iCarsoft or Foxwell or maybe ISTA/INPA a scan may give a better clue as to where the issue is. I have a feeling that your combox is at fault I would talk to guys like Cartronix, ECU Testing and BBA Reman if they can test and repair it may save a lot of issues. Swapping for another Combox may need re-coding which will require either the software or the help of a BMW Specialist Just a thought here, your phone connects by bluetooth so logically if the cars antenna were disconnected it should stop the combox calling (no aerial) while your mobile would use it's internal antenna so would still work. Not a fix but may be a short term work around Dave