JUNE 30, 2009 | Gabriel Brown: Mobile voice is a phenomenon. Together with SMS, it accounts for 85 percent of the world's $800 billion per year mobile services market, according to the latest estimates in the Global Mobile Data Forecast from Pyramid Research (Heavy Reading's sister company).

But for operators evaluating the investment case for Long Term Evolution (LTE) mobile broadband networks, there's concern that this next-generation technology doesn't yet adequately support their most critical and profitable circuit-switch applications: voice and SMS.

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