Call log with ring length

It is some thing like the build-in call log. But it can show how long the income call rang. So that you can find out how important that missed call was.
With long click menu, you can delete all call log with specific number.

NOTE: Only the calls occured after the apps first launch can show the ring length.

Recent changes:
V2.9.1
Fixed Xperia X10 pro mini add a contact to use this program may be an unexpected application termination issues.