A few of the major ICs on the backside of the motherboard:

Samsung KLMAG2GE4A 16 GB MLC NAND Flash + Controller

Avago ACPM-7051 Quad-Band GSM/EDGE and Dual-Band UMTS (B1/B5) Power Amplifier

Inside Secure SecuRead 972-DC-C6 NFC Solution Module

Qualcomm WCD9310 Audio Codec

ST Microelectronics LIS3DH 3-axis MEMS Accelerometer

STMicroelectronics LSM330DLC 3D Accelerometer & 3D Gyroscope