The new Blackberry Bold 9900/9930. (AP/Research in Motion)

All four major carriers will be carrying the phone, either as the BlackBerry 9900 on AT&T and T-Mobile or as the CDMA variety, the 9930 on Verizon Wireless and Sprint Nextel. T-Mobile’s version of the handset will run on its 4G HSPA+ network.

The Bold will be available for T-Mobile’s business customers on Aug.17, and for everyone else on Aug. 31.

The 4G Bold will set you back $299.99 following a $50 mail-in rebate and requires a two-year data plan.

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