Forget the phone lock code. i forgotten the code for my N73 cell phone,when i switch on the

Question

i forgotten the code for my N73 cell phone,when i switch on the phone,i have to enter the code to activate my phone,now i have forgotten the code and how do i unlock my phone? the handphone shop is asking for $70 to refresh the phone and unlock it and it takes 3days. is there any other way that i can get to unlock the phone?Hi, I have a Samung SGH-G600 phone on O2 and I have forgotton my phone lock code. When I switch the phone on it asks for the Phone Lock code but rejects anything I think it is with "wrong password". My imei no is 356773/01/988516/1. Can anyone help me please? Thanks