Cannot make or receive calls , says Not Registered on Network
Open the device settings.
Click the network then select forget network.
Reboot the device.
Go back into settings and reconnect.
Have you tried cleaning and then reinserting the sim card?
You don't say which samsung mobile the device is. If it's a dual sim then try placing the sim card in the other sim slot. If it's a very old mobile then it might not be supported.
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