CallClear is an application which will permit you to delete your calls one by one in your history instead of deleting them all.
You can crack it as below step:
1) Download this file zip here and then unzip it.
2) Install the official CallClear from Cydia
3) Over SSH, delete this file: /Applications/iCallBR.app/iCallBR
4) Put the iCallBR from the file zip in Step 1, with 0755 permission (RWX-RX-RX)
5) Over SSH, delete this file: /Library/MobileSubstrate/DynamicLibraries/CallClear.dylib
6) Put the CallClear.dylib from the zip in Step 1, with 0755 permission (RWX-RX-RX)
7) Restart your device and enjoy!