Something like a Pixel-Qi screen would be beneficial in cloudless desert climates. An entirely reflective screen might be even better. City dwellers have no need to think about this, but there are many parts of the world where the outdoors aren't illuminated at night. If people are about after dark, they are likely to already have their own source of illumination with them.
A thicker, more robust form factor that's waterproof and buoyant might be beneficial for other climates. June through September is India's Monsoon season. That doesn't strike me as the friendliest climate for an iPhone.
Something like a Pixel-Qi screen would be beneficial in cloudless desert climates. An entirely reflective screen might be even better. City dwellers have no need to think about this, but there are many parts of the world where the outdoors aren't illuminated at night. If people are about after dark, they are likely to already have their own source of illumination with them.
A thicker, more robust form factor that's waterproof and buoyant might be beneficial for other climates. June through September is India's Monsoon season. That doesn't strike me as the friendliest climate for an iPhone.