How to fix iMessage "Not Delivered" error on iPhones

iMessage is generally a reliable communication tool for iPhone users, but occasionally, messages may fail to send, resulting in a "Not Delivered" error. This issue can be frustrating, but it is often caused by simple connectivity problems or software glitches. To resolve this, users should first check their internet connection, ensuring that both Wi-Fi and cellular data are functioning correctly. Toggling Airplane Mode on and off can also help reset network connections. Additionally, ensuring that iMessage is enabled in the settings menu is crucial. If the problem persists, restarting the device or checking for the latest iOS updates can often clear up underlying software conflicts. By systematically verifying network settings and application configurations, most users can restore iMessage functionality without needing professional technical support.