Smartphone unable to detect SIM card
4.5
The device shows "No SIM Card" or "Insert SIM" even when a card is present.
Symptoms
- No SIM icon
- Emergency calls only
- SIM settings greyed out
Possible Causes
- Dirty SIM contacts
- Damaged SIM tray
- Faulty SIM card
- Modem crash
Step-by-Step Fix
1
Re-insert SIM
Power off, remove tray, clean SIM with a dry cloth, and re-insert.
2
Test Another SIM
Try a known working SIM to rule out card failure.
3
Reset Network Settings
Clears saved network configurations.
When to See a Technician
If multiple SIMs fail, the internal SIM reader pins may be bent or broken.
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