If your Android phone's display is showing "No Signal," there are a few troubleshooting steps you can try. First, make sure your phone's battery is charged and the SIM card is properly inserted. If the problem persists, check the network settings, restart your phone, or try inserting the SIM card into another compatible device to rule out SIM card issues. If none of these solutions work, it may be necessary to contact your service provider for further assistance.