Wireless services provider

Western Wireless

(WWCA)

said it billed fewer-than-expected roaming minutes in the fourth quarter because of a nationwide slowdown in traveling.

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The company expects to report fourth-quarter service revenue of $208 million to $211 million, and fourth-quarter roaming revenue of $54 million to $55 million -- a result it called "disappointing." The company expects to post fourth-quarter EBITDA of $73 million to $75 million.

The company said it expects to report net subscriber additions of 19,000 for the quarter and an average monthly churn rate of 2.3%. It cited efforts to convert analog subscribers to digital for "downward pressure on growth and cash flow."

On Instinet, the company's shares were down $4.52, or 18%, to $20.95.