1)Firstly, Download APK file of the app SimCity BuildIt 1.12.11.43315 for Android.
2)Copy the APK file to your Android device's SD card and Install it. (Don't open it after installation)
3)Download Obb files and copy the *.obb file named 'main.1008013.com.ea.game.simcitymobile_row.obb' into the required location:
/SDCARD/Android/obb/com.ea.game.simcitymobile_row/
4)The full/absolute path of the obb file should look like as the following (Case-sensitive):
/SDCARD/Android/obb/com.ea.game.simcitymobile_row/main.1008013.com.ea.game.simcitymobile_row.obb
If there is no such location, you need to create the path or folder manually on your SD card.