Hello BRAINZ2013.
Thanks for the quick response.
I have to add that the LG Spirit is a coworker. he lived for many years in the U.S., and returned to Brazil at the end of the year.
And, of course, brought with it the phone. As he did not intend to return, the LG is only useful if it can be used with any national carrier.
I have a good experience with installing ROM's, but never tried to unlock a phone (I have a Xiaomi Mi2Sc). Know if something can be done, remembering that I have access to the keyboard? (by not having any network connection does not complete)