Does the iPhone 4S support 4G / LTE?
Some individuals are mistaking the "4S" as an indication that the new, speedier iPhone supports the LTE standard, more commonly known as 4G. This is not the case. The new iPhone supports HSPA+ at 14.4Mbps, a speed boost of data connection speeds that will be available only to owners using the iPhone on the AT&T network.
The iPhone 4S does not support LTE. Most likely, Apple plans to release an LTE version of the iPhone as the iPhone 5, once LTE networks offer more coverage throughout the country and also once a more diminutive, affordable LTE chipset becomes available.