For a long time, a foldable phone was the sort of thing you admired in a shop window rather than something you actually bought. They were fragile, wildly expensive, and the software rarely made the most of the hinge builds. That's no longer the story. Creases have shrunk, hinges have become more durable, batteries capacities have increased, and crucially, prices have started to settle into the range serious buyers would consider.
Samsung still leads on maturity, Google has quietly built one of the most capable folds around, Motorola keeps the flip fun and affordable, and now Apple has thrown its hat in the ring with the iPhone Duo. No single phone runs away with it, which is exactly why it's worth comparing them properly before you spend four figures.