Yes it is possible to hack Nokia 1600 security code with a simple trick for that do the following steps
1.press "unlock" button
2.then press "back"
3.then deep press unlock and then suddenly press *
4.that's all you unlocked the phone successfully.
NOTE: trick to hack/crack nokia phones password will not work on all nokia phones
so please check the nokia phones before practising the trick;but the trick can effectively crack/hack
most non java enabled nokia phones