Major Challenges for iPhone App Development in 2021. 1. Storage 2. Beta testing 3. Connectivity 4. Compatibility 5. Security 6. Design 7. Approval 8. Battery life 9. Different platforms Conclusion in Challenges for iPhone App Development. There are various challenges that app developers usually face while developing an iPhone application. This is because of the latest updates and changes in guidelines by apple frequently. But developing an application above all these challenges can help the developer to provide the best user experience. It only requires knowledge of modern technology and uses of skills along with innovation. This might appear as a typical task. But not an impossible one. It just requires an app developer to keep pace with the latest technology and other desires of the customers.