For international travel, customers have the option of two Data Global Add-On plans: $25 allows 20MB of use before overage, while $60 grants 50MB. In each case, the package only covers 29 countries, including Canada, China, Germany and the United Kingdom. AT&T is currently offering a temporary discount as an incentive for upgrades and new clients. People who enter an iPhone Enterprise Data Plan by March 31st are eligible for a $25 credit per month, running through December 31st. Customers must however make active use of both their voice and data coverage, and may not receive the first credit until two billing cycles after activation. Moreover, all iPhone Enterprise plans require a new or renewed two-year contract.