Disassembling the 6500 slide is easy enough but you wont unlock it with a FREE code, you'd have to buy one from a professional unlock business. Depends on the network you are on as to how much it will cost.
To take phone apart, you will need a T5 screwdriver, don't use any other or you'll stuff the screws & that will make the job near on impossible if that happens :o/
Disassemble, go here & find your phone
http://repair4mobilephone.org/cell_phone.html
GATORS
Craig, October 2008