Indonesia's telecoms authority said it could take up to a month to restore Internet capacity, which had fallen to just 17 percent following Tuesday's quakes.
Analysts said it was too early to estimate the total financial losses caused by the week's Internet mayhem.
"They are the hardest hit, I would say," said Sachin Mittal at Singapore's DBS Vickers Securities.
"Probably all the [other] telcos will be less than Chunghwa," he said.
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