Of course, this is easy. AT&T has LTE everywhere in Boston. Hell, when they launched LTE, it covered a huge portion of Eastern Mass and they didn't deploy some half-assed network, like TMobile, where you would only get LTE some places. It went from the Mass/NH border all the way to Providence.
I know this for a fact because Boston was an LTE launch market for AT&T and I picked up my Skyrocket the day the network went live. VZW is similar. I can drive hundreds of miles on both VZW and AT&T and stay on LTE, but TMobile? some HSPA+ and mostly EDGE.
You can't lump in Sprint and TMo with the big two. Hell, Sprint's LTE deployment is more pathetic than TMo's refarming. LTE has been delayed here for months and they only have some parts of the city done
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LMAO. You can't possible believe those coverage maps are 100% accurate. They are merely projections based on the amount of towers in an area. I know strips of interstate 10 that are shown as covered by every major carrier on the maps and you'll see no service for miles regardless of the branding on the back of your phone.