Phone Filter will hangup on all calls that are not in your contacts list. Use this to block all unrecognized phone numbers that call you. In other words, if the inbound number calling you is in your contact list then phone filter just allows you to answer the call as normal, otherwise it just does what ever action you have specified in your phone settings to process the call. For example: go to voice mail, set as busy, ignore, etc.

A list of timestamps is displayed in the app front-end if you keep it running so you can monitor the call times.

No contact information is saved in the app, and only the contact phone number is used to verify the validity.