results-
completely blank for everything: "invalid tunnel name" (
FAIL)
user: isp.cingular / blank / blank : "Error: Open tunnel - failure" (
FAIL)
user: proxy / blank / blank : "Error: Open tunnel - failure" (
FAIL)
user: wap.cingular / blank / blank:
SUCCESS! (no username/pwd needed)
thus I will stick with wap.cingular for now.
YMMV.