Reasons :
Airplane mode is turned on. Airplane mode will disable all wireless connections on your phone, including cellular data and voice calls. Make sure that Airplane mode is turned off.
Your phone is in a dead zone. If you are in an area with poor cellular reception, you may not be able to make or receive calls. Try moving to a different location with better reception.
Your phone is not connected to a cellular network. Make sure that your phone is connected to a cellular network. You can check this by opening the Settings app and looking for the "Cellular" or "Mobile data" option. If this option is turned off, turn it on.
Your phone bill is not paid. If your phone bill is not paid, your carrier may have suspended your service, which would prevent you from making calls. Check your account balance and make sure that your bill is paid.
Your SIM card is not inserted correctly or is damaged. The SIM card is what allows your phone to connect to the cellular network. Make sure that the SIM card is inserted correctly and is not damaged.
Your phone has a software problem. There may be a software problem on your phone that is preventing you from making calls. Try restarting your phone or updating the software.
If none of the above operations can solve your problem, please back up your data and go to the nearest realme customer service center for testing.
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