Phone "SIM Card" Not Detected (No Service)
4.5
Your phone says "No SIM" or "Invalid SIM" even though the card is inside.
Symptoms
- No service
- Emergency calls only
- SIM error
Possible Causes
- Dirty SIM contacts
- Damaged SIM tray
- Carrier lock
Step-by-Step Fix
1
Clean the SIM Card
Remove the card and wipe the gold contacts with a dry cloth.
2
Try a Different SIM
Test another card to see if the problem is the card or the phone's reader.
3
Check for Carrier Lock
Ensure the phone isn't locked to a different network.
When to See a Technician
SIM cards can fail over time due to heat and friction. A replacement from your carrier is usually free.
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