I moved my iPads from separate accounts to the mobile share plan with no activation fees. It was a major hassle though. Had to cancel the prepaid plans and issue new phone numbers and reassociate the sims. Now that everything is done it seems great.
As for hotspot on the iPad, it isn't available. Yes, it should be but from what I can tell AT&T still hasn't enabled it, even with the new mobileshare plans. I can see the hotspot options on my iPhone but not on the iPad. A call to customer service confirmed the same.
Thanks for the update. Did you have to go to the store to get new SIM cards for your iPads or were you able to take care of it over the phone? (some other forums had users stating that they needed to go to the store to get new SIM cards because they had activated prepaid plans on them)
the customer support person said it would be enabled with iOS 6, but i'm not sure where they got that information. she made it sound like she was reading apple support docs.
I really hope that's the case.
it does appear to be the case. i upgraded my ipad to iOS 6 today, and the hotspot feature is now enabled and working. i have the 1GB mobile share data plan on AT&T.