Hi mate,
its always good to search the net (google) before asking question. A quick search would have showed you that u can either remote unlock or flash unlock the w810.
1) Remote: using ur phone details a unlock code is generated that you can type into your phone and it will be unlocked Costs around £3-£10 not gaurenteed to work
2) Flash: walk into any dodgy looking phone shop as for it to be unlokced done withing 5mins - 1 hour gaurenteed to work costs around £10
If your looking for a free instant way... well... it simply doesnt exist and is not worth the hassel.
Hope this helps and enjoy digitalworldz remeber always give ack when u can
P