Apple CEO Steve Jobs said there are no international plans to reveal yet, but the company hopes to have them in place by the June-July timeframe. The device will come unlocked and will use GSM micro-SIM cards.
"We'll be back this summer with some even better deals for our customers internationally," he said.
Typically, he noted, cell phone companies charge $60 per month for their mobile data plans.
"We think we've got a real breakthrough here," Jobs said.
Jobs said the $14.99 250MB data plan is a "fair bit of data" that most people will "get by on." Both it and the $29.99 unlimited plan come with free access to AT&T's nationwide Wi-Fi hotspots.
"They have more Wi-Fi hotspots than anyone," Jobs said.
As a contract-free purchase, users can buy a 3G-enabled version of the iPad starting at $629. The AT&T network access can be purchased -- or canceled -- at any time directly from the iPad.
"We think it's a phenomenal offer," Jobs said.