The memory used by iPhone12 series is still LPDDR4 and does not use LPDDR5, iPhone12 4GB memory, iPhone12Pro is 6GB memory, memory supplier from Micron, flash memory chip from Samsung.
On the iPhone12 series baseband model, it is equipped with the X55 5G baseband from Qualcomm, which is the one carried on the 865 platform Android flagship this year, and the antenna design changes, so the theoretical signal performance should also be better than last year's 11 series.