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The PMB9955 is the baseband chip used in the iPhone XR, iPhone XS and iPhone XS Max. It is responsible for transmitting simultaneous voice and data transfer on LTE (provided the carrier has the infrastructure to allow simultaneous voice and data transfer.)

Known Firmware Versions

iPhone XR, iPhone XS and iPhone XS Max

1.00.07     12.0          (Build 16A366)
1.00.08     12.0.1        (Build 16A405)
1.01.12     12.1 beta     (Build 16B5059d)
1.01.20-1   12.1 beta 2   (Build 16B5068i)
1.01.27     12.1 beta 3   (Build 16B5077c)
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