Check Service Call System app permissions. If any of these permissions required to use your device's features are disenabled, Service Call System might not work.
Uninstall and reinstall Service Call System. If nothing else has worked, completely uninstall Service Call System then reinstall.
Restart your device. Last, restarting your device can often clear most problems causing Service Call System not working
2. Fix Service Call System Server issues & Internet Connection
Check network connection: An unstable Internet will make Service Call System be unable to connect to it's servers. Ensure your wi-fi is working then restart app.
Disable VPN: VPN can cause connection errors and lead to Service Call System not working. Make sure all VPNs are off
Enable background data: When Background data is turned off, Service Call System may not be able to connect to the Internet when running in the background.
Reported Issues
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