Can I use a locked AT&T hotspot on the AT&T prepaid hotspot plans

Hi!

I want to get on the AT&T prepaid hotspot plans and am looking at buying a hotspot. I am interested in the purchasing a netgear MR1100 or netgear MR6110, but the ones I can find are locked to AT&T. Would that be a problem for me to try to bring a locked AT&T hotspot to a prepaid plan? Or does the hotspot need to be unlocked for me to bring it to an AT&T prepaid hotspot plan?