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So to answer some questions, 4g modules started showing up in late built 2017 i3’s. Another thing, you are able to swap modules
With 4g, but sadly, it needs to be connected to the bmw system in order to operate and it needs to be linked to your car of course. But bmw will not allow the connectivity of the module to their connected services. So technically there is no way for someone to upgrade from 3g to 4g until either an aftermarket kit comes off that would be approved by bmw connected services
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