How do I fix "Not registered on a network" when a Samsung phone cannot make calls?
Answer
Not registered on a network usually means the phone cannot attach to the carrier, often from Airplane mode leftovers, a SIM/eSIM glitch, or a temporary carrier outage. Toggle Airplane mode, reseat or re-download the SIM profile, then restart; if it still fails, confirm the line is active with the carrier.
Follow these steps
Toggle Airplane mode
Swipe down the quick settings panel, turn Airplane mode on for 15 seconds, then turn it off and wait for signal bars to return.
You should see: The phone attempts to reattach to the carrier and the not-registered status clears, or it remains.
Check SIM / mobile network settings
Go to Settings > Connections > Mobile networks (wording may vary) and confirm the correct SIM is selected, mobile data/network operators are not stuck on a manual wrong network, and Airplane mode is fully off.
You should see: The preferred SIM and network settings look correct for your carrier.
Reseat the SIM or refresh the eSIM
For a physical SIM, power off, reseat the SIM, and power on. For eSIM, use the carrier’s official app or settings path to refresh/download the line if offered, then restart.
You should see: The phone detects the SIM/eSIM again and tries to register.
Confirm the line is active with the carrier
If the message remains, sign in to the carrier account or contact carrier support to verify the number is active and provisioned for this phone’s IMEI/SIM.
You should see: The carrier confirms the line is active, or identifies an account issue blocking registration.
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Extra tips
What to look for: The status text not registered on a network, missing signal bars for mobile (not just Wi-Fi), and whether Wi-Fi calling or other apps still work.
Before you change anything: Confirm whether Wi-Fi still works while cellular calls fail. Know your carrier and whether the phone uses a physical SIM or eSIM. Avoid random “network unlock” apps or callers asking for account codes. Note any recent plan changes or travel that could affect registration.