Yet another indexing issue.

I am having issues with an Index.
Here is the query

SELECT * FROM phonecalls WHERE istatus = 0 AND (sfor = 'pat' OR
sfor='TECHIES') ORDER BY ipri DESC, dplaceddate;
I have tried '0' and jut plain 0 as well as type casting it with ::int4 .

Here is the index I think it should use.

CREATE INDEX phonecallspoll ON phonecalls USING btree (sfor varchar_ops,
istatus int4_ops);
But it is still doing a scan?

Any suggestions?
yes I have used Vacumme with the anylise option.
Thanks for any info.