https://support.fairphone.com/hc/en-us/articles/10489306843409-Install-a-Micro-SD-Card
According to their site, you should still be able to upgrade storage space with a micro sd. Another recommendation is that if you do buy a fairphone dont buy the adapter from usb c to aux from them, ive bought 2 from them and they both broke within half a year.
https://support.fairphone.com/hc/en-us/articles/10489306843409-Install-a-Micro-SD-Card According to their site, you should still be able to upgrade storage space with a micro sd. Another recommendation is that if you do buy a fairphone dont buy the adapter from usb c to aux from them, ive bought 2 from them and they both broke within half a year.