Netgear mr1100 Nat impossible?

Has anyone with att ever actually managed to get an open nat out of the mr1100. The settings are there but i have not, nor have i found any post where someone had managed to get these settings to function. This is not a cheap piece of tech and alot of us bought the thing on the basis that it was the only mobile hotspot with nat settings. Ive read dozens of posts and everyone just gives up. Is there a fix or not?