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I will be assisting you to fix the issue you are having.
May I know what troubleshooting have you done?
What brand/model of your phone?
Can you please elaborate the issue so that I may assist you further?
Pull down from the top of the phone's screen to access Quick Settings or go to Settings > Network & internet > Airplane mode. Make sure airplane mode is disabled. Check that mobile data is enabled. To check, go to your phone's Quick Settings or Settings > Network & internet > Mobile Network.
Try to remove your sim and put it back again
Click this link https://www.youtube.com/watch?v=ln2AGqd8S7Y
Check if your sim is fault, you can check if your SIM is faulty by inserting it in another mobile phone. Check for a bad app issue. One of the common reasons for calling issues on many Android phones is a bad third party app. Try to run your Galaxy S10 to safe mode and see if calls work. If your device can make calls normally on safe mode only, that means that you have a third party app problem. These are the steps to boot to safe mode: