Siemens and AT&T Wireless make their entrance into the Pocket PC phone market with the introduction of the SX56, which should be available this month. This device should look familiar--its hardware is identical to that of the T-Mobile Pocket PC phone. The main difference between the two models, both of which cost $550, is AT&T Wireless's Workware software suite, the company's new mobile enterprise service that allows business users to access e-mail and other server-based desktop applications while away from the office.
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