Manufacturers don’t make displays under 6 inches available for purchase, with special cases (such as the iPhone Mini) being made under exclusive contracts. The best lead they have so far is to try to use displays designed for the front part of a foldable phone, but they’re yet to strike an agreement.
TIL that display manufacturers are also part of the reason why we aren’t getting small phones and why it’s probably even harder for manufacturers like Fairphone to make them.
It was that VoLTE wasn’t supported for that particular model of phone. VoLTE is very much the norm here although I’m unsure if every phone uses it now. My flip phone probably doesn’t, but it’s hard to tell with how stripped down its manufacturer-customized Android is.