How to change my sim card from default to visible?

i just changed my mobile phone and got a blackberry 8310 my sim card by itself its on default mode so whenever i change phone i have to change it to visible through mobile options. i tried to change it but i cant find the corresponding option on the blackberry... can someone tell me how to change it ? step by step plzHow to change my sim card from default to visible?
go to options%26gt;mobile network%26gt; it will be in there.

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