Phone bar code setting

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As I am using the below mentioned OS version and Radio. I have a call barring for all outgoing INTERNATIONAL calls. Whenever I need to dial an int'l call. Thru the built-in selection for disabling the bar code, this options pops an error saying to check my phone settings!

But when I use the dial buttons to press the keys combination which my ISP provides #331*----# (dash are digits), this works on the spot in either cases, the on and off!

Any help

hello,
i have t-mobile mda II (under wm5 ,i think software is O2),
does anybody know standard password for this phone? i'd like to change CALL BARRING SETTINGS, i need CALL BARRING PASSWORD.
thanks.

as wm5 is not offical
i doubt it's a real o2 rom
and CALL BARRING sounds
very very much like something
put in the sim rather then on the
phone