@Arif3: Sorry to hear that you're experiencing network issues on your Galaxy S20. Have you noticed if you're losing signal in a specific area/region, or is it persistent in all areas? Are you able to try another SIM card in the device to see if you notice an improvement? Similarly, can you try your current SIM in another compatible mobile, as this will help to determine if the issue lies with the phone or your network/SIM. In the meantime, as a basic troubleshooting step, please try pressing the Volume Down and Power buttons together until the phone restarts, as this will refresh the device and address any temporary issues that might be a contributing factor.