Users can't run wvdial due to wvdial.conf permissions

[David Jarvie <lists@astrojar.org.uk>]

I get the following error message running wvdial as an ordinary user (not as 
root):
    Can't read config file /etc/wvdial.conf: Permission denied

The permissions  for the file are "--w------T " and the owner/group is 
root.root. The user is a member of the dialout group. I tried giving read 
access to the owner, but that didn't work either. It only worked when I gave 
read access to group or other, which is not desirable when passwords are 
stored in the file.

Any ideas on how to enable users to run wvdial while retaining security on 
wvdial.conf?