Check the SIM card's active data plan, test it in another device, enable data roaming if needed, and configure the APN manually if issues persist.
Follow these steps:
- Check that the SIM card has an active data plan.
- Test the SIM card in another device (mobile phone) – activate mobile data and disconnect Wi-Fi.
- Enable data roaming if necessary.
- If the problem persists, you may need to configure the APN manually.