If you are using an Infuse, I don't believe it's capable of LTE connectivity, although the LTE infrastructure may help with the HSPA+ capabilities. Here in the Tulsa area, strictly HSPA+/3G, I usually get about 3000 kbps, so it does seem to be an improvement over that. Not sure what AT&T "target" speeds are for HSPA+ or LTE, although I believe I have read some test results of LTE 4G being anywhere from 12 - 30,000 kbps.