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To manually check for carrier settings updates on an iPhone, navigating to General > About is the correct approach. This path allows the device to check for any available updates to its carrier settings, which can affect performance, connectivity, and features provided by the carrier.

When you access the About section, the iPhone recognizes whether a new carrier settings update is available and prompts you to install it if one is present. This process ensures that the device has the latest configurations provided by your carrier, leading to optimal functionality.

Other options, such as removing and re-adding your eSIM or turning off your cellular line, do not directly lead to checking for carrier settings updates and are not standard steps for this specific task. Additionally, although Software Update manages iOS system updates, it does not include carrier settings updates, which indicates that this option would not yield the desired results. Thus, navigating to General > About remains the proper method for checking and applying carrier settings updates.