If your telephone number is not working, please check the following:

1. Confirm your service status: Check whether your subscription is active. You can view the expiration date through our platform at my.modulus.gr.
2. Check your balance: If you are trying to make an outgoing call or have configured call forwarding, make sure that your balance is sufficient for the specific action.
3. Internet connection: Make sure that your device is connected to the internet.
4. Device configuration: Check whether your device has been configured correctly. For detailed instructions, please refer to the configuration section of the Help Center.
5. Contact Technical Support: If the issue persists, please contact the Customer Technical Support department at 13713.