A Samsung Galaxy S21 user reported a persistent “no service” issue, despite trying several fixes, including updating the phone, replacing the SIM card, and switching service providers. The phone works fine in-store but loses service elsewhere.
Potential Causes:
- Signal Coverage: The user may live in an area with poor network coverage.
- Hardware Issue: A faulty internal antenna could be causing the problem.
- Network Settings: Incorrect APN settings or the phone set to the wrong network mode (e.g., 3G instead of 4G/5G).
Possible Solutions:
- Check Network Settings: Ensure 4G or 5G mode is enabled, along with VoLTE.
- Signal Extender: Use a signal booster to improve reception at home.
- Diagnostic Tool:
- Restart the device and dial *#9900# in the Phone app.
- Run “cp based log” and save it to the SD card.
- Navigate to the log folder in internal storage, locate the err folder, and open the CP_MEMBERS.txt file inside the ss_log folder.
- Search for “WARNING” to identify any error messages.
- Hardware Repair: Consider having the phone checked for hardware issues like a damaged antenna.
For unresolved issues, contacting Samsung for further diagnostics might be necessary.
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