HTC droid dna Mode D'Emploi

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3. From the list, tap a contact to call. 
If you selected a contact whose phone number has a leading zero,
Droid DNA by HTC will automatically prepend it with your home
country code when dialing. If there's already a plus (+) sign and
country code before the phone number, Droid DNA by HTC will just
dial as is.
Droid DNA by HTC dials as is and does not prepend your home
country code when you call phone numbers that are not stored in
Droid DNA by HTC. When manually entering a phone number to
call, you need to enter a plus (+) sign and country code before the
number.
Editing a country’s international call settings
1. Slide the Notifications panel open, and then tap 
 > Call.
2. Tap Assisted Dialing.
3. Under Reference Country, select the country whose settings you
want to edit.
4. Tap   > Edit.
5. Edit the Country Code, IDD Prefix (International Direct Dial), NDD
Prefix (National Direct Dial), Area/City Code and National Number
Length (length of phone number).
6. Tap Save.
7. Tap Done.
Phone calls
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