For me now work with version 4.6.16
I solved it in this way
1 With root browser I saved the file /system/app/Phonesky.ak in sdcard
2 With titanium backup I uninstalled version 4.8.20 (Phonesky is deleted)
3 I restored Phonesky.apk in /system/app,
4 I installed version 4.6.6
now works with all...