The national disaster agency said Friday that the confirmed death toll rose slightly to 1,571.
He hinted the urgency to get the devices resume operation.
False reports claiming that another huge quake was about to hit Sulawesi island - which is already reeling from last Friday's double tragedy that has killed over 1,400 people - have circulated online in recent days.
The UN Resident Coordinator in Indonesia, Ms. Anita Nirody, said, "The natural disaster and tsunami effectively cut off much of Palu and Donggala for several days due to landslides and damage to infrastructure, and has created significant logistical and access challenges". We, too, need food, ' " McCarthy said.
Worldwide help for survivors has gathered pace, but communities in more remote areas have been cut off by broken roads, landslides and crippled communications, leaving people increasingly desperate for basic needs as aid has only just begun to trickle through.
More than 50 Australian medical professionals will provide emergency health support, as the government talks to Indonesia about what else might be needed.
"There are still large areas of what might be the worst-affected areas that haven't been properly reached, but the teams are pushing, they are doing what they can", Jens Laerke, from the UN's humanitarian office, told reporters late Tuesday.
About 1,700 houses in one neighborhood were swallowed up by ground liquefaction, which happens when soil shaken by an quake behaves like a liquid, and hundreds of people are believed to have perished, the disaster agency said.
Van Deinse said she had been with an IFRC team that sought to bring supplies to the small village of Petobo, near Palu - only to discover that, for all intents and purposes, the village no longer even existed. Communications are down and bridges and roads have been destroyed or blocked by slips.
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Debris of collapsed houses and roads mixed and piled up to each other, witnesses said. Fuel remained another concern, with villagers forced to queue at pumps for more than six hours.
The military was deploying battalions to the hardest-hit two cities to ensure the security of stores and mini markets, so that people can buy food and groceries.
Worldwide efforts to help survivors of Indonesia's devastating quake and tsunami are gathering pace as concern grows for hundreds of thousands with little food and water, six days after disaster struck.
Underlining a growing sense of urgency, President Joko Widodo was due to make his second visit to the disaster zone on Wednesday.
Further up the coast in Donggala, which was close to the epicentre of the quake and also suffered substantial damage, about 200 men gathered at a mosque.
The damage at Mutiara Sis Al-Jufri airport.
Palu's port, a key transit point for aid, has been damaged.
Supply of gasoline has also been gradually improving as the government ordered state-run oil and gas firm Pertamina to mobilize its gasoline stocks stored in provinces around Central Sulawesi to Palu.