Vonage Holdings Corp., an Internet phone-service provider, infringed six patents owned by competitor Sprint Nextel Corp. and should pay $69.5 million in damages, a jury decided.

Vonage shares fell 66 cents, or 34 percent, to $1.30 at 4:32 p.m. in New York Stock Exchange composite trading. Trading was halted for almost two hours immediately after the verdict.

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