User manual

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If you need to record audio from specific numbers, tap "Record
Specified Numbers".
Select numbers from "Calls", "Groups" or "Contacts" to add to the
Auto-record list.
Tap > "Edit" in the upper right corner to delete the numbers that
you do not want to record automatically.
Turn on "Record All Unknown Numbers", your phone will
automatically record all unknown phone calls.
Turn on "Record All Calls" to record every phone call.
Check Call Recordings
After recording the call, you can play, share, or delete the recording or
set the recording as ringtone.
Go to "File Manager" and tap "Audio" to find all saved call
recordings.
Tap "Select" in the upper right corner to select recordings to be cut,
copied, deleted, or set as private, etc.
Recordings Storage Limit
There is no storage limit for call recordings in ColorOS 7.1. Otherwise,
you can also set a limit for recording storage on your own for better
usage of the phone.