[iMore Question]

I am not an AT&T customer . I've purchased an ipad mini with AT&T data capability. My husband has the same ipad. I want to know if I can share the data plan with my husband,

[BreakingKayfabe]

Only by inserting the sim card from your iPad to his. In order to share data, you would have to sign up with AT&T for a shared data plan. There is no shared data between different sim cards if you just add data to your iPad from within the Cellular Data settings.

[Tartarus]

You can turn on Personal Hotspot. Your husband will be able to use your data plan as long as you're in his proximity with your iPad.

[DroidArmy]

You can turn on Personal Hotspot. Your husband will be able to use your data plan as long as you're in his proximity with your iPad.

A little addition to what Yukhalisel said. You need to have a data plan which supports the personal hotspot option for this to work. You'll see it show up right under cellular in settings if you have one of these plans.