What initial checks should you perform if calls are not going through on a device?

When troubleshooting issues with calls not going through, checking the antenna and cables is crucial because these components directly affect the device's ability to communicate with the network. If the antenna is damaged or improperly connected, the device may not receive or transmit signals effectively, leading to call failures. Inspecting and ensuring that the antenna and cables are intact can often reveal physical issues that may be preventing successful connections.

While other factors like the SIM card, battery level, and airplane mode may play roles in connectivity problems, issues with the antenna and cables can have a more immediate and profound impact on call functionality. Therefore, confirming that these hardware elements are functioning properly is a vital first step in troubleshooting.