What characteristic makes a smartphone truly sustainable according to the text?

Resposta

A smartphone is truly sustainable if it can be easily repaired by its owner.

A sustainable smartphone is designed so that the user can replace or fix its components without needing professional help.
This reduces electronic waste by extending the device’s life.
For example, some laptops are made with modular parts that users can swap themselves, like replacing the keyboard or battery, which helps avoid discarding the whole laptop if one part breaks.