HTC One M8 User Manual page 174

174 Video chat and phone calls
7. Tap Done.
Resetting the reference country to default
1. Go to Settings, and then tap Call.
2. Tap Assisted Dialing > Reference Country.
3. Under Reference Country, tap the bar and select the country whose
settings you want to set to default values.
4. Tap > Set Default.
5. Tap Done.
Turning off Assisted dialing
1. Go to Settings, and then tap Call.
2. Tap Assisted Dialing.
3. Clear the Use Assisted Dialing option.
4. Tap .