GSamsung S8 International Version - Unlocked
I just had ATT put a Sim card into an unlocked out-of-the-box S8 international version which uses LTE bands that are compatible with the bands that ATT uses. Problem is that it only connects at HSPA+ speeds. If I take the ATT sim sim card that works with LTE on my LG V30 and insert it into to S8, the S8 shows LTE connectivity. The ATT Protech advanced level techs say that it's a phone issue even though ProTech Tier 1 said they were seeing Sim Card related errors.