Key takeaways:A quarter of smartphone owners (25%) don't find AI features helpful, 45% are reluctant to pay a monthly subscription fee for AI capabilities and 34% have privacy concerns.A little over half (52%) of smartphone owners have no interest in purchasing a foldable phone.The biggest motivation for US adult smartphone owners to upgrade their devices is longer battery life (61%), followed by more storage (46%) and better camera features (38%). Just 18% say their main motivator is AI integra...