AT&T is rolling out LTE in some markets but they are years behind Verizon but ahead of Sprint.
AT&T plays games with the term 4g so I'm not sure if the poster with the unlocked T-Mobile phone is getting LTE or H+.
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I wouldn't say they are ahead of Sprint...
Sprint is doing things a bit differently than other carriers. When AT&T starts working in a city on HSPA+, they don't turn the tower on for anything except testing until the ENTIRE area is covered..meaning every tower in that specific sub-contractors work area is complete. THEN, they turn it on, and people go "WOW I GOT THEM 4G's".
Sprint, however, isn't completing cities and turning on 4G...they are turning on towers as they get them updated (with backhaul and equipment)...
So even though Sprint only shows it has a couple of cities that are active 4G, they have hundreds of 4G sites that are already being used by subscribers, in about 30 of the 50 US states.
S4GRU can give specifics on which cities, but there are people siting 4G almost daily, but definitely weekly in different areas. Even though you won't find where it says that city may be 4G active....it may have 75% completion, and people are blazing on their 4G (TRUE) with speedtests from them showing some 20+mbps download, and 10+mbps uploads.
I know for a fact that Sprint has done SOMETHING in my area, because I used to see ATROCIOUS data speeds...but I don't hardly ever use data away from home...I had done speedtests while out in the little city near me...and I never saw under a 400ms pingtime, a .30mbps download, and a .10mbps upload....until yesterday. I decided to do some tests while at the DR with my son getting his ortho appt set-up from where he broke his arm...and the first speedtest popped over 1.06mbps download right away...with a 119ms ping. I thought "eh, fluke with speedtest app..can't be right. It'll settle down and slowly drift to .30mbps again"....
I was way wrong. I did 19 speedtests, and every single one was over 1.00mbps download, over .60mbps upload, and had under 130ms ping times. That's just on 3G...so if they are working near me, I'll def see it light up soon and report it's sighting on the S4GRU lists.