For 100% protection against improper use, you can lock your telephone electronically. Here, you only know the secret code. You can lock/allow Local, STD or ISD calls in many way viz. all calls allowed, only local calls allowed, only STD & Local calls allowed, all outgoing calls barred etc.
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later on, if anyone forgot the code then visit ur nearest BSNL exchange to get it reset again.
by
by
Bandhan Preet Singh,
Broadband Engineer (TTA),
BSNL, Mohali, Chd., Punjab.
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