Nokia 5130

Hello,
my nameis ehetesham.
I forgot my phone lock code i,e of nokia 5130 xprees music.
How can i recover my lock code and my phone i not accepting any other sim card it is aking about the lock code how can i get bck the code as i forgot the code.Its not coming by the normal code i,e 12345.
plz tell me iam waiting for ur reply plz mail mee..........