Table below copied from this Google Sheets document for archival purposes. Original by reddit user /u/SamGewissies and shared in this thread.

Fairphone 3 Fairphone 2 Fairphone 1
OS Android 9 Android 7.1.2 Nougat Android 4.2.2
Processors Qualcomm Snapdragon 632 Snapdragon 801, Qualcomm MSM8974AB-AB MediaTek MT 6589 (quad-core) 1.2 GHz
64-bit Octa-Core processor
Processor speed up to 2.2GHz
Quad-Core 2.26 GHz Qualcomm
GPU Qualcomm Adreno 506 650 MHZ GPU Qualcomm Adreno 330 GPU 578 MHz, 2 GB LPDDR3
RAM 4GB 2 GB LPDDR3 1 GB
Flash Storage 64gb 32 GB eMMC5 16 GB
SAR rating Max SAR head (W/kg @ 10g) = 0.388
Max SAR body (W/kg @ 10g) = 1.405
SAR10g: 0.65 W/kg (Head) SAR10g: 1.1 W/kg (Body) 0.318 W/kg
Networks
Configuration Dual Nano Sim Dual-SIM, Dual-Standby (DSDS)
Network Technology 4G (LTE) Cat. 13, 3G (HSPA+), HSDPA - Cat 24, HSUPA - Cat 8 2G / 3G / 4G LTE-Advanced
GSM/GPRS/EDGE Frequencies - 850, 900, 1800, 1900 Mhz Quad-band: 850, 900, 1800, 1900 MHz GSM 850 900 1800 1900
WCDMA: Bands 1 (2100 MHz), 2 (1900 MHz), 8 (900 MHz) WCDMA 900 2100
Connectivity
WLAN IEEE 802.11 b/g/n/ac, 2.4 GHz and 5 GHz IEEE 802.11 b/g/n/ac, 2.4 GHz and 5 GHz
Bluetooth 5 + LE 4.0 LE and earlier
GPS / GNSS GNSS standards: GPS, Glonass, BeiDou, Galileo, A-GPS support GPS, A-GPS, Glonass
FM Radio with RDS FM Radio
Miracast support
Display
Display Size 2160 x 1080 resolution, 427ppi pixel density 5 inch Full HD, 1080 × 1920, Pixel Density 446 ppi LCD 960×540 px qHD 256 ppi
Cover Glass Gorrilla Glass 5 Gorilla Glass 3 (0.7 mm thick) Dragontrail glass
Display Type 18:9 LCD (IPS) touchscreen LCD TFT/IPS 4.3 in (110 mm) diagonal IPS LCD
No. of colors 16 million supporting 16M colours
Main Camera 12MP resolution with HDR: IMX363 sensor, Dual LED flash 12MP CMOS Sensor with dual flash: Omnivision OV12870 - Back Side Illuminated 8 MP AF (stabilization + image sensor)
Image sensor size 1/2.55" sensor 1/2.8 inch, Pixel Size: 1.25μm x 1.25μm
F-number f1.8 aperature f/2.2
Video speed 4K, 720p, 1080p @ 30fps 30 fps
Max video resolution 3840 x 2160
Front Camera 8MP resolution with HDR 5MP CMOS Sensor: Omnivision OV5670 1.3 MP
Image sensor size 1/4" sensor 1/5 inch, Pixel Size 1.12μm x 1.12μm
F-number f2.0 aperature f/2.4
Audio External speaker loudness: 95db @ 10cm Speaker: Built-in, Rear-facing
Headset Jack 3.5 mm 3.5 mm
Interface and Connectors
USB Port USB Type - C, USB 2.0 support Micro-B 2.0 with OTG support
MicroSD Support: External storage: microSD SDHC, SDXC, UHS microSD up to 64 GB
Expansion Port: Backside - connectivity to external case, USB 2.0 Device Interface + Power Input
Sensors Ambient Light, Accelerometer, Gyroscope, Proximity, Barometer, Compass Ambient Light, Proximity, 3-axis Compass, 3D Accelerometer, 3D Gyroscope
Battery and Power 3060 mAH capacity with Quickcharge 3.0 support Removable Battery Pack: 2420 mAh at 3.8V (9.2 Wh), Lithium-Ion 2000 mAh, 3,7V, W20S
Dimensions and Weight Slim case phone
Length 158mm 144.5 mm 126.0 mm (4.96 in) H
Width 71.8mm 74.5 mm 63.5 mm (2.50 in) W
Thickness 9.89mm 10.6 mm (back of case to top of glass) 10 mm (0.39 in) D
Weight: 187.4g 148 g (phone) + 16 g (external case) 170 g (6.0 oz)
Sim ports Nano SIM (4FF) double fit micro SIM card (3FF)(ID-000 format), sized: 15mm x 12mm x 0.76mm.
Energy use
Standby (idle) 300 hours up to 240 hours
Calling on LTE (4G) (screen off) 20 hours 16 hours
Video streaming on LTE (4G) up to 4 hours
3.5 hour charging time