If you have a OnePlus smartphone recently bought in China, you will no longer be able to make calls on it
OPPO, which owns the brand, has blocked the ability to make calls.
The blocking applies to those smartphones that were purchased in China, but activated in another country. What is the reason for this innovation is unknown. OnePlus is not officially sold in Russia, so official OPPO support sends you to hell and advises you to contact the place where you purchased the device.