There is no security code(builded in the phone) to block outgoing calls. But exist a international codes....*33*xxxx# (and call) to activate the "block" and #33*xxxx#(and call) to deactivate restriction. the "xxxx" is a network code....is 0000 if you not changed meantime. By the way, *35*xxxx# block incoming calls and #35*xxxx# unblock incoming calls. Search on google for those codes. Good luck!
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