Yes, you can add an iPad or tablet to your existing AT&T account (data-only) for $20.99/month.
When you’re ready to add a line to your account, follow these steps:
Step 1: Visit ATT.com and sign in to your account
Step 2: Select the Add a device option
Step 3: Decide if you’ll be connecting your own device or buying a new device
Step 4: Pick the plan and features for your new line
Step 5: Set up and activate the new line on your AT&T wireless plan
Step 6: If you purchased a new device, you can usually pick it up in-store the same day, or choose if you want to have it delivered Shop tablets, including the newest iPads or learn how to bring your own device (BYOD) to AT&T.
Shop tablets, including the newest iPads, or learn how to bring your own device to AT&T.