More chips on the underside of the logic board:

Qualcomm PM8018 RF power management IC

Hynix H2JTDG2MBR 128 Gb (16 GB) NAND flash

Apple 338S1131 dialog power management IC*

Apple 338S1117 Cirrus Logic Class D Amplifiers. The die inside is a Cirrus Logic device (second image) but it does not look like the audio codec.

STMicroelectronics L3G4200D (AGD5/2235/G8SBI ) low-power three-axis gyroscope—same as seen in the iPhone 4S, iPad 2, and other leading smart phones

Murata 339S0171 (based on Broadcom BCM4334) Wi-Fi module