Nowadays there are lot of ways available to unlock your phone like using network unlock code,software,via cable etc..According to my experience i vote for unlock code.It's one of the best and safe way to unlock your mobile.You can get an unlock code from your service provider or else try to buy an unlock code from any one of the online unlocking service provider like Unlocking4Free.com They will provide free unlocking service for old mobile models only.If you have newest version of mobile means use Unlock-Zone.com Once unlock your phone,you will be able to use your phone with any carrier.