An iPhone app development agency specializes in building applications optimized specifically for iPhone devices. These agencies focus on performance optimization, intuitive user interfaces, and smooth device-level integrations. Development processes include UI/UX design, native coding with Swift, quality assurance, and compliance with App Store guidelines. iPhone applications often integrate advanced features such as Face ID, GPS, push notifications, and secure payment gateways. The goal is to deliver stable, visually appealing, and user-centric apps that perform efficiently across different iPhone models and screen sizes.