Man, I'll like to answer your question in Spanish, but I cannot... So, here is what I think you want to do: I think you want to unlock (desbloquear) your phone to be used with other carriers (companias) but you cannot because it's locked to the network...
There are two ways, if it's a prepaid one after one year they should allow you to do so. If it's on a contract you'll have to wait that the contract end and ask them to unlock your device.
Or... You skip the preliminaries and search online a site that can unlock Xperia devices.
