According to Tech Insights the new iPhones use a Broadcom BCM4377 Wi-Fi/Bluetooth wireless combo SoC. The BCM4377 is not publicly listed, and probably custom made for Apple. The closest related however is the BCM4375, also a Wi-Fi/Bluetooth combo chip. And it supports 802.11ax (recently branded as Wi-Fi 6 by the Wi-Fi Alliance).
BCM4375
Dual-Band 802.11ax Wi-Fi/Bluetooth 5.0+ Combo Chip
The BCM4375 simultaneously implements two streams of 802.11ax with Bluetooth 5.0+ to enable Wi-Fi speeds up to 1.429 Gb/s on mobile devices such as smartphones and tablets.
Features
BCM4375
Dual-Band 802.11ax Wi-Fi/Bluetooth 5.0+ Combo Chip
The BCM4375 simultaneously implements two streams of 802.11ax with Bluetooth 5.0+ to enable Wi-Fi speeds up to 1.429 Gb/s on mobile devices such as smartphones and tablets.
Features
- Support for two streams of 802.11ax
- Bluetooth 5.0+ including Low-Energy Long Range (LELR)
- Real Simultaneous Dual-Band (RSDB)
- 1.429 Gbps PHY rate
- 1024 QAM modulation
- OFDMA
- MU-MIMO