HTC One (M8) User Manual page 94

94 Phone calls
Changing the default country code for Home dialing
1. Go to Settings, and then tap Call.
2. Tap Home dialing settings.
3. Select a country, and then tap OK.
Turning off Home dialing
If you prefer to manually enter complete phone numbers to call while roaming, you
can turn off Home dialing.
1. Go to Settings, and then tap Call.
2. Under Other settings, clear the Home dialing option.