Can I bypass the PIN code request of a Nokia phone by changing the SIM card?

You can, for the ordinary SIM pin.

But if the phone is locked using a different kind of PIN code, then no.That would have to be unlocked by hard resetting the phone.

>if i changed the SIM will there still be a request for the new SIM’s PIN number?

If the SIM is brand new and nobody has used it before, there will be no PIN request.

It will ask for a PIN if you’ve set one yourself, otherwise, by default, there is no PIN.

yes you can
bcoz pin code is used for sim locking
but phone lock and lock code is used for phone locking