I received a Russian text message for no reason.

First of all, if you want to send an international short message, you need to confirm that the international long-distance service has been opened. In addition, if you have confirmed that it is the international area code of Russia. Russia has a number with the length of 10 after the country code (3 domestic long-distance area codes and 7 local telephone numbers). In Russia, the number starting with 9 is the mobile phone number. International SMS costs about one yuan depending on the number communication company you use.