The iPhone XR is only one generation of iPhone old now, released at the same time as the iPhone XS and also most of the same specs as the iPhone XS, the same A12 Bionic system on a chip, and the main camera is the same spec, at 12MP.
Being a slightly less expensive phone than the iPhone XS, the XR only has one camera whereas the iPhone XS from the same year had two. The current iPhone 11, which replaces the XR also has two, one for the main camera and one for wide shots.
The iPhone XR has a LCD display, at 6.1-inches and has Face ID for logging into the phone.
Today on amazon.co.uk, the iPhone XR is down from £749 to £629.