Samsung's U.S. smartphone market share has surged to 31%, while Apple's has declined to 49%, signaling a renewed rivalry between the two companies. Samsung's innovative foldable phones, like the Z Fold 7, are gaining traction and contributing to its market gains, while Apple is expected to introduce new form factors, including a potential folding iPhone by 2026. The shift in market dynamics is also influenced by tariffs and varying product ranges offered by Samsung.