244bea2a_Android_Secret_Codes_and_Hacks__Description
[Code] *#*#8351#*#* [Function] Dialer Log Enabled [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
Android Secret Codes and Hacks
Description