M.2 would make phones inordinately thick and un-usable. If you really need more than 1TB of storage on your phone, dump your pictures and Videos every so often to a home NAS PC running TrueNAS Core or Scale. And if you have Music on your phone that you own the files to, consider using your home NAS as a Media Server using Plex and use Plex Amp or some other app to stream the music direct to your phone.
M.2 would make phones inordinately thick and un-usable. If you really need more than 1TB of storage on your phone, dump your pictures and Videos every so often to a home NAS PC running TrueNAS Core or Scale. And if you have Music on your phone that you own the files to, consider using your home NAS as a Media Server using Plex and use Plex Amp or some other app to stream the music direct to your phone.