ive used damus on iphone 6 before
Discussion
that might be 6(s), higher iOS version and its got twice more RAM than the 6
it was. yes
the only nostr client that works on ios 12 is nostr:npub1plstrz6dhu8q4fq0e4rjpxe2fxe5x87y2w6xpm70gh9qh5tt66kqkgkx8j its pretty crazy but you cant zap, wos still works on ios12 too