The default Security Code for Nokia 5310 is 12345. Try using that, or try reverting to factory settings. However, if nothing works try to refresh your mobile's software by typing in *22899. If all fails take your Cell phone to the nearest Nokia service center.
I think Security Code of this mobile 1234 Because all of the Nokia Cell has this no
only, OK you Just try it...
only, OK you Just try it...