How to Fix Xiaomi Phone SIM Card Not Supported Error

A Xiaomi phone not receiving calls is usually caused by call blocking, SIM or network errors, HyperOS notification limits, or a ringtone setting problem. To fix incoming call not ringing on Xiaomi, check mobile signal, disable Do Not Disturb, confirm call notifications are allowed, and reset network settings if calls still fail.

Steps

1. Check signal, SIM status, and Airplane mode

   Open Settings > SIM cards & mobile networks and confirm the active SIM is enabled. Turn Airplane mode off. Reinsert the SIM if the network name is missing or calls go straight to unavailable.

2. Turn off Do Not Disturb and call forwarding

   Open Settings > Sound & vibration and disable Do Not Disturb. Then open the Phone app call settings and make sure call forwarding is off unless a forwarding number is intentionally set.

3. Allow Phone app notifications and full-screen alerts

   Open Settings > Notifications > App notifications > Phone. Enable notifications, sound, lock screen display, and full-screen incoming call alerts. A common fix for call HyperOS issues is restoring full-screen call pop-up permission.

4. Check blocked numbers and ringtone settings

   Open the Phone app settings and review Blocked numbers. Then confirm a ringtone is selected and volume is raised under Sound & vibration. Silent ringtone or low ring volume often causes incoming call not ringing on Xiaomi.

5. Reset network settings and update HyperOS

   Open Settings > Connection & sharing > Reset Wi-Fi, mobile networks, and Bluetooth. After reset, restart the phone. Also install the latest HyperOS update, since modem and call bugs are often fixed in system patches.

Common Issues and Fixes

• Phone receives messages but not calls — Likely cause: carrier registration problem. Fix: toggle SIM off and on, restart, and contact the carrier if incoming calls still fail.
• Incoming call not ringing Xiaomi — Likely cause: ringtone muted, Bluetooth audio routing, or DND. Fix: raise ring volume, disconnect audio devices, and disable DND.
• Call screen never appears — Likely cause: Phone app notification restriction in HyperOS. Fix: allow pop-up, lock screen, and full-screen notifications for the Phone app.
• Only some numbers cannot get through — Likely cause: blocked contacts or spam filter. Fix: review blocked list and spam protection settings.
• Calls fail after update — Likely cause: network configuration conflict. Fix: reset network settings and install the next available patch.

Quick Tips

• Dual SIM models can default calls to the wrong SIM. Confirm the correct SIM is selected for voice calls.
• VoLTE or Wi-Fi calling can break incoming calls on some carriers. Toggle each option off once to test.
• Third-party cleaner, security, or call-screening apps can suppress call alerts. Disable them temporarily.
• Indoor-only call failures may be caused by weak LTE coverage rather than a phone fault.

Related Questions

Why is a Xiaomi phone not receiving calls but mobile data still works?

Mobile data can work even when voice registration fails. Re-registering the SIM, disabling VoLTE for testing, or resetting network settings usually resolves the mismatch.

How to fix call HyperOS problems after a system update?

Update the Phone app and HyperOS first, then check Phone notifications and full-screen alert permissions. If the issue remains, reset network settings and restart the device.