What should a user do if messages are not being delivered from their iPhone?

When messages are not being delivered from an iPhone, enabling text forwarding in message settings is a valid step to troubleshoot and resolve the issue. This feature allows the user's texts to be forwarded to other devices linked with their Apple ID. If the user's iPhone is not receiving deliveries properly, it might suggest that the device is not properly configured for handling text messages, especially when they are using multiple devices.

In many cases, configuring message forwarding can address issues with messages not appearing on all devices or being misrouted due to account settings. By ensuring that the text message forwarding feature is set up correctly, it increases the chances that incoming and outgoing messages will function as intended across all compatible devices.

While other options might seem relevant, they do not directly contribute to resolving the issue in most scenarios. Disabling iMessage would actually prevent texts from being sent or received through that service. Changing the Apple ID could complicate the situation further and might not be necessary if the primary issue is configuration-related. Clearing the message app cache is not a supported function on iPhones, as Apple does not provide a direct method to clear app caches like some other platforms do. Therefore, enabling text forwarding is the most appropriate and effective step to take when facing delivery issues with messages