b758e25a_s___Smartphone_Review_and_Tips__Function
[Code] *#*#8351#*#* [Description] Records your last 20 calls and stores them on your phone, you can find the data in the following /data/data/com.android.voicedialer/app_logdir [Function] 
Dialer Log Enabled
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Android secret codes | Smartphone Review and Tips
Function