As others mentioned, the 4G in that image is the AT&T version of the One, they had that on all their LTE phones. Part of their version of the build. Our unlocked versions just say if we are in HSPA (H) or on LTE. "4G" is just a marketing word.. both HSPA+ and LTE are 4G.
technically though, isn't HSPA = 3G+? i think at&t made the mistake of calling H+, 4G. people get confused with 4G and 4G LTE. so basically, H+ = 3G+, and LTE = 4G?
Can you please tell me what you did to get the LET or 4G working on your HTC One DE. I have the same phone and cannot get anything more than Edge. Did you call customer service or add a specific APN etc. Thanks!