Hello mahamudfromDhaka,
Thanks for asking the Apple Support Communities for help with your iPhone X and "No SIM Card installed" alert. Please try the troubleshooting provided in this help article:
If you get an alert about the SIM card in your iPhone
Thanks and have a wonderful day.
Thanks for asking the Apple Support Communities for help with your iPhone X and "No SIM Card installed" alert. Please try the troubleshooting provided in this help article:
If you get an alert about the SIM card in your iPhone
Thanks and have a wonderful day.