Loaded the international firmware on my LT28at and it works fine so far. Loaded the apn that I posted earlier and the wifi hotspot worked fine. Not in an LTE area though so I couldn't test that. I'm setting it all up now and will try using it for the next few days and see if I notice any issues.
OnePlus One // Xperia Z Ultra // Lumia 1020 // Xperia Tablet Z // Surface Pro
Sony Smart Wireless Headset pro MW1 // Smart Bluetooth Handset SBH52 // Z Ultra Power Cover CP12
iPhone 1st Gen/3GS/4S // Nexus One // Dell Streak // Atrix 4g // Lumia 900, 920 // Xperia Play, S, P, ion, TL, Z, Z1 // iPad 1, 3
Click here for my Xperia firmware downloads.
Thanks button if I helped.