База телефонных номеров РФ is a free Android application developed by Wutapp that allows users to get information about any phone number in Russia without an internet connection. The app supports all phone numbers in the Russian Federation, and it can help users identify the city and operator of any phone number. The application is capable of determining the operator to whom the phone number originally belonged. One of the significant advantages of this application is that it does not require an internet connection and works entirely offline.

To use the app, users need to enter the phone number they want to search for, and the app will provide information about the city and operator. This app is an excellent tool for people who need to identify the city of origin of a phone number. The supported number formats include (9xx)-xxx-xx-xx, (8xx)-xxx-xx-xx, (4xx)-xxx-xx-xx, and (3xx)-xxx-xx-xx.

Overall, База телефонных номеров РФ is a useful app for anyone who needs to identify the city and operator of a phone number in Russia without an internet connection.