AT&T has announced that it is making several major changes to its data plan offerings, including those for the iPhone and iPad, as well as giving a concrete timeframe for its iPhone tethering launch. The single $30 unlimited iPhone data plan will be replaced by a pair of options: DataPlus, which offers 200MB of data for $15 per month, and DataPro, which provides 2GB of data for $25. Should a customer exceed their data limit, they will receive either an extra 200MB of data for $15 on DataPlus plans or an extra 1GB of data for $10 on DataPro plans. Similar changes will be made to the company’s iPad data offerings, with the $30 unlimited plan being replaced by the new $25 for 2GB a month plan. All of the data plans offer free access to more than 20,000 AT&T Wi-Fi Hot Spots as well. Finally, AT&T will be offering iPhone tethering to customers on DataPro plans for an extra $20 per month; the feature will be available when iPhone OS 4.0 is released. Current customers are not required to switch to the new plans but can do so if they wish without extending their contracts; the plans will be available beginning June 7.