Zsh, 107 bytes

print -l iPhone{,\ {{3G,4}{,S},5{,c,s},6{,s}{,\ Plus},SE,{7,8}{,\ Plus},X{,R,S,S\ Max},11{,\ Pro{,\ Max}}}}

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A long brace expansion. Bash/sh need printf %s\\n instead for 4 extra bytes.

Zsh, 107 105 bytes

-2 bytes due to leniency on trailing spaces

print -l iPhone\ {,{3G,4}{,S},5{,c,s},6{,s}{,\ Plus},SE,{7,8}{,\ Plus},X{,R,S,S\ Max},11{,\ Pro{,\ Max}}}

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A long brace expansion. Bash/sh need printf %s\\n instead for 4 extra bytes.