this is what I did in the mean time.
I saved the PROV XML file from my phone
and I modified with the straight talk info but i'm not sure if is ok.
__PROV__ATTS_US_310_410_ENG.xml (this is after I renamed) and I can load it from MFG app and view it in the "View current profile" just is not working.
I saved an detailed list of the xml prov files on the following link
I tested the phone with a T-Mobile sim card and the internet worked out of the box (in EDGE mode) so i thing the phone is OK.
No luck with Straight Talk yet