But the park's backcountry has no cellular telephone service, and the storm hit during a busy time, noted Chief Ranger Clayton Jordan.

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The system would be modeled on a method used by cellular telephone service providers to warn each other about people who have a poor record of paying their bills.

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The Philippine cellphone market has been growing at an exceptional rate, riding on the crest of the popularity of SMS (short messaging system), in which subscribers send text messages to each other, and on the poor service of the largest landline and longtime telephone monopoly PLDT, which operates Globe's closest cellular rival, Smart.

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