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Is it possible to check your SIM card on another phone and/or another SIM card on your phone?
Hello there, Without the information requested in my first/previous response, I can only give you a general answer, but I hope this helps.
You can soft reset or force reboot it. Press and hold down the Power button and Volume Down button at the same time for 10-20 seconds or until it shows the Samsung logo. This will force reboot it.
Then open Settings > general management > Reset and tap Reset Network Settings. Then check if it is working now.
Please let me know if that didn't work, so we can continue troubleshooting.
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