Will Lumia 535 work on AT&T in the USA? 3G only or HSPA+ ??

Will the Lumia 535 DS work on AT&T in the USA?
Only 3G or is HSPA+ supported?

Please elaborate?

Duplicate thread: please answer only at this link (http://forums.windowscentral.com/ask...only-hspa.html) to keep all advice in one thread.