root i9070 JB www . androidiani . com/forum/samsung-galaxy-s-advance-i9070/324247-guida-root-unroot-per-android-4-1-2-a.html
Poi flash kernel CoCore-E-8.0-TWRP ( forum.xda-developers . com/showthread.php?t=2140597] )
infine installa "Total Recall - Call Recorder" standard version; usa metodo.B (PlayStore)