I think so ... you just will not get LTE ... so downloads will be limited probably to around 2 - 5 Mbps, with uploads being around 1 Mbps. It depends on what AT&T has outfitted in the area. With a lot of folks having LTE devices now, it could free up some bandwidth for you.
Should be just fine surfing, email, etc. As a mobile hot spot though ... it may be a little sluggish ... especially the uploads.