How to UNLOCK/SIM-FREE W595 ?

Hey,
I recentley got a new samsung phone and i want to give me last Sony Ericsson W595 to me Mom. My mom is in another cellular company and i need to unlock the server.
I tried in 2 softwares: Aerix (which is not supported any more) and d Ultimate Unlocker (which is cost money). So if there is a way to unlock the server please give it to me.
thanks, itay

W595 is A2 Plataform.. and have'nt free unlock, only pay metods like SE Tool Box or Omnius

Instead of using tools you can use unlocking codes. I unlocked my mobile at MobileUnlockSolutions using unlock codes very quickly. Surely you will get a solution for your mobile too.