This program change phone from 8XXXYYYYYYY to +7XXXYYYYYYY in your phone book. There are 2 modes: 1) manual - confirm each change. 2) auto - change all phones like 8XXXYYYYYYY to +7XXXYYYYYYY.
According to the antivirus report, 8 to +7 doesn't contain viruses or any kind of malware. This application was originally designed by GRuV and it refers to the Communication category. On Google Play, the app was rated 5 by its users.
Over 50K users downloaded 8 to +7 and the latest update was launched on Dec 6, 2017. There are advertisements in this application. The statistics show that the app is popular mostly among Samsung and Sony users.
Use the opportunity to download the .apk installer of 8 to +7 1.5.0 free of charge and have a look at users' reviews on Droid Informer. The installer occupies 737 KB of disk space and it runs on Android devices 4.0 and above.