Installing an IPA file on an iPhone is essential for developers and testers who need to try out internal builds, conduct pre-release testing, or distribute apps outside the App Store. While the process is more complex than downloading from the App Store, several methods can simplify it, including using tools like AltStore, Xcode, Apple Configurator 2, and cloud-based solutions such as LambdaTest. AltStore allows IPA installations without jailbreaking by using a developer-signed app, while Xcode and Apple Configurator offer more traditional methods for enterprise deployments. LambdaTest provides a cloud-based platform to test IPA files on real iOS devices without needing physical hardware. These methods require prerequisites such as a compatible iOS version, a valid provisioning profile, and an Apple ID. Despite the complexities, these approaches enable comprehensive testing and distribution of iOS applications, facilitating reliable app delivery for developers, QA teams, and enterprises.