Cedar Falls, Iowa, school officials hope caller identification will help prevent prank calls and bogus bomb threats.

After a bogus school-wide bomb threat in early February that disrupted classes, Superintendent Dan Smith said he fielded several telephone calls from parents asking why the district didn't have Caller ID.

At the time of the threats, the district's telephone carrier, U.S. West, indicated it was not possible for the district to get ID boxes because it had so many telephone lines. The school district had 80 telephone lines, but only 36 outside lines.

"That created kind...

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