What is the first troubleshooting step when a device shows no service in the status bar?

The first troubleshooting step when a device shows no service in the status bar is to restart the device. Restarting can resolve temporary glitches or minor software issues that could be affecting the device's ability to connect to the cellular network. This simple action often refreshes the device's connection to the network and can restore service without the need for additional steps.

In many cases, electronic devices can experience brief interruptions in connectivity due to background processes or software states that a restart can clear. It's a widely recommended first step in troubleshooting various device-related issues because it is quick, doesn't require extensive knowledge or tools, and can often lead to immediate resolution of the problem.

Other options like checking for software updates, resetting network settings, or contacting customer support are valid steps, but they typically come into play after a restart has not resolved the issue. They involve more complex processes or additional time and resources, making them less efficient as initial troubleshooting steps.