how to erase all nokia phone SMS

I have an old Nokia portable phone, RM-638 model 6303ci
I want to erase all SMS I have sent (more that 1.500 are registered !)
When I try this, it asks for a code
I tried the PIN of my SIM card, refused.
I don't know what to enter there !
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LeTayAsked:
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zalazarCommented:
As far as I know, the default Nokia security code is
12345

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SunBowCommented:
sounds good
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