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wireless operators have spent upgrading their networks to offer such multimedia content as videos and music, they are insufficient for the job. The problem is that they are designed for two-way, on-demand access. To broadcast programming on such networks would require that each show be sent to each subscriber separatelyóan impossibly time-consuming and expensive proposition. "It 's very difficult to offer high-definition TV on a handset through existing networks, "says Andrew Cole, an analyst with A. T. Kearney. "You have to offload that through a separate network. "Advertisement Several initiatives are under way to achieve just that, a separate wireless network built specifically for one-way multimedia broadcasting.

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Open up the clamshell 's sturdy hinge, and you 'll immediately see the Z500a 's problem: Slightly recessed keypad buttons. These buttons don 't click to tell your fingers you 've successfully pressed them, which is frustrating when you 're dialing. There are also no "pick-up "or "hang-up "buttons. That 's a standard Sony Ericsson trick, but it 's generally adequate. The external color display works for picture caller ID and as a camera viewfinder.

As for features, the Z500a supports MP3 ringtones and has two built-in Java games, a loop-based ringtone composer, AIM and e-mail clients, and room for about 83 VGA pictures. Games played fast enough, but the awful keypad made game-playing a chore rather than a joy.