Apple always wants you to have the newest iPhone, but what would you say is the oldest model or iOS that would still be good to get?

Something that has most of the current features and wouldn't be too outdated.

Apple always wants you to have the newest iPhone, but what would you say is the oldest model or iOS that would still be good to get?
Apple always wants you to have the newest iPhone, but what would you say is the oldest model or iOS that would still be good to get?
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