Codes, some of you may find usefull ...

[lynx]

CALL BARRING CODES

All calls
Set: *330*barring code#[SEND]
Cancel: #330*barring code#[SEND]
Query: *#330#[SEND]

Outgoing calls
Set: *333*barring code#[SEND]
Cancel: #333*barring code#[SEND]
Query: *#333#[SEND]

Incoming calls
Set: *35*barring code#[SEND]
Cancel: #35*barring code#[SEND]
Query: *#35#[SEND]

Outgoing international calls
Set: *331*barring code#[SEND]
Cancel: #331*barring code#[SEND]
Query: *#331#[SEND]

Outgoing international calls except to home country
Set: *332*barring code#[SEND]
Cancel: #332*barring code#[SEND]
Query: *#332#[SEND]

Incoming calls when outside home country
Set: *351*barring code#[SEND]
Cancel: #351*barring code#[SEND]
Query: *#351#[SEND]
Cancel All Call Barring
#330*barring code#[SEND]

PIN Related
Change Call Barring pin code **03*oldpin*newpin*newpin#
Change SIM pin code **04*oldpin*newpin*newpin#
Change SIM pin2 code **042*oldpin*newpin*newpin#
Unblock SIM pin code **05*PUK*newpin*newpin#
Unblock SIM pin code **06*PUK2*newpin*newpin#

[rct]

It's worth bearing in mind that most (if not all) of these settings may be accessed through the "Barrings" menu on your (relatively modern) mobile ;)