Smartphone SIM card detected but no signal
4.5
The SIM is recognized, but the phone shows "No Service" or empty signal bars.
Symptoms
- No signal bars
- Searching... message
- Calls/Data fail
Possible Causes
- Out of coverage
- Carrier outage
- IMEI blacklisted
- Antenna failure
Step-by-Step Fix
1
Check Coverage
Ensure you are in an area with carrier service.
2
Select Network Manually
Go to Settings > Network > Manual and pick your carrier.
3
Toggle Airplane Mode
Forces the modem to re-scan for towers.
When to See a Technician
A "Searching" state that never ends often indicates a hardware issue with the baseband processor.
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