HTC One M8 for Windows - Manual (Page 107)

Call history
Access the call history to check missed calls, your dialed numbers, and
received calls.
Checking calls in the call history
1. On the Start screen, tap .
2. In the history list, you can:
§ Press and hold a number or contact name and delete it.
§ Tap next to a number or contact name to go to the profile
list where you can choose to return the call, send a text
message, save the number (if it's not yet stored in your
contacts), and more.
Adding a new phone number from the call history to your
contacts
1. On the Start screen, tap .
2. Tap next to the phone number that you want to save and then
tap .
3. Tap to create a new contact.
4. If you have more than one account set up on your phone, tap the
account you want to create the contact in.
5. Edit the number if you need to and select the phone number type.
6. Add the contact name and other information and then tap .
Phone calls 107