To make your life easier, DFNDR offers an option to save an unknown number from any incoming call that has lasted more than two minutes.
Once the call is finished, a message will appear for you offering to save the contact as a new one. If you want to save the number, select Confirm.
You will be redirected to the dialer on your device and the number that called you will be already inserted. Enter the contact information and select save or return to confirm.
Ready! The new contact is saved in your contacts list.