Requirements : iOS Device, Filza (mine is jailbroken so get this from cydia but there is a version for unjailbroken devices just google it) , Voicepack.
Step 1 : Download a voicepack. I have some here. http://www.mediafire.com/file/kkk1kdawy8s2if4/PUIBGM_VoicePack.zip/file
Step 2 : Unzip the file in filza. Choose the pack u want and go into it until u find Active.sav
Step 3 : Copy Active.sav from the custom voicepack and navigate to /var/mobile/Containers/Data/Application/PUBG MOBILE/Documents/ShadowTrackerExtra/Saved/SaveGames
Step 4 : MAKE A BACKUP OF THE ORIGINAL !!
Step 5 : Paste the custom Active.sav file into the folder and replace the original one.
Step 6 : Restart your game and test it out in Training mode.
You can do this on Android as well with a file manager and the correct folder. Anyone knows where that is can comment down below for others.
Enjoy!
