SDX70M

The Qualcomm Snapdragon X70 5G Modem is the baseband chipset used in the iPhone 15, iPhone 15 Plus, iPhone 15 Pro and iPhone 15 Pro Max.

it is also known as  in firmware.

iOS and iPadOS
1.00.03    17.0           (Build 21A326, 21A327 & 21A331) 17.0.1        (Build 21A340) 17.0.2        (Build 21A350) 1.11.00    17.1 beta      (Build 21B5045h)