Fairphone 4
Fairphone 4 is a smartphone designed and marketed by Fairphone. It succeeds the Fairphone 3+ and was succeeded by the Fairphone 5. It was announced on 30 September 2021, and was available for order on 25 October 2021. Major upgrades from the predecessor include a larger display, better camera with optical image stabilization, improved selfie camera, 5G support, IP54 dust and splash protection and MIL810G certification, USB-C port, bigger battery, 20W fast charging among other changes. It comes with Android 11 “Red Velvet Cake” with promised two major Android updates (Android 12 “Snow Cone” and Android 13 “Tiramisu”) and up to 5 years of warranty. Materials 
The Fairphone 4 is made with Fairtrade-certified gold, aluminum from Aluminium Stewardship Initiative (ASI) Performance Standard certified vendors, fair tungsten from Rwanda, recycled tin, rare earth minerals, and plastics. Modular design

The phone's modular design is constructed of seven modules, making it easier to repair than most smartphones. The rear of the phone can be removed without using tools. Having removed the rear, the battery can be lifted out and replaced. The display is easily removed using a regular Phillips #00 screwdriver, and the modules are held in using only press fit sockets. Operating systems 
CalyxOS 4.2.7, Android 13, is available for the Fairphone 4 as of December 2022. In April 2022, CalyxOS provided "test builds" of Android 12L. /e/ supports Fairphone 4, but Ron Amadeo at Ars Technica in April 2020 warned, "they'll most likely be on an old version of Android". Reception 
The Fairphone 4 received mostly positive reviews praising its guarantee of software support until 2025 and up to 5 years of warranty and improvements over its predecessor. However, the lack of a headphone jack was criticized, along with the occasional sluggish performance and the quality of the camera and fingerprint sensor. See also
 Fairphone 1
 Fairphone 2
 Fairphone 3
 Fairphone 3+
 Modular phone

References 

Fair trade brands
Modular smartphones
Android (operating system) devices
Ubuntu Touch devices
Mobile phones introduced in 2021
Mobile phones with user-replaceable battery
Smartphones