Upgrade your iPhone effortlessly! Learn step-by-step methods to transfer data from iPhone to iPhone, including Quick Start, iCloud, iTunes, and third-party apps. Follow these tips for a smooth transition. Also, troubleshoot iPhone issues like headphone jack problems. Dive into a stress-free upgrade today! How do you transfer data from iPhone to iPhone? Upgrading your phone can be a fun and exciting activity. However, transferring the data from one device to another can be a hassle. Though various apps might help with the process, there is a strong possibility for complications due to compatibility issues.