Softbank announced yesterday that starting from July 21, 2010 their subscribers will be able to get an “unlimited data plan” for their global roaming-enabled mobile phones in return for a separate daily charge of up to 1,480 yen until June 30, 2011. After that date, the fee will be raised to 1,980 yen.

The plan will be offered through a limited number of carriers in nearly 30 countries including Britain, France, China, Hong Kong, South Korea, Singapore, Taiwan, Thailand and the United States.