Thanks for the clarification. I keep seeing 4G LTE on my ATT S4 with my Tmobile Sim but I was not sure if it was really LTE.
Why are there tutorials for "How to Enable T-Mobile HSPA+ AWS Bands on AT&T Galaxy S4 SGH-i337/SGH-i337M!"
Does this mean that the 4G LTE bands work but 3G/4G HSPA+...