TCM

If you receive a call from a contact who doesn't exist in your filing system, and you have opened the Incoming Call screen, you can enter their details without closing the call screen down.
Do a search for their name to make sure the contact doesn't exist in your filing system, if the search shows the message 'No matches found' click on the 'New' button.

The 'New Contact' screen will appear

Enter the details for the contact and when you have finished click on the 'Create' button to save the contacts details. You will then find yourself back at the call screen where you can make a record of the call.