Apple has said it is "deeply offended" by a BBC investigation into conditions for workers involved in manufacturing its devices.
Rules on workers' hours, ID cards, dormitories, work meetings and juvenile workers were routinely breached, the Panorama programme witnessed.
In a staff email, senior Apple executive Jeff Williams said he knew of no other company doing as much as Apple to improve conditions.
But he added: "We can still do better."
Panorama's editor Ceri Thomas said he stood by the programme's journalism.
He said the team had found an exhausted workforce making Apple products in China, as well as children working in extremely dangerous tin mines in Bangka, Indonesia.
"While Apple did confirm earlier this year that it gets tin from Bangka, it had never been confirmed whether illegal tin was entering their supply chain," he said.
"We got the first evidence of this on our trip.
"We told Apple what we had found almost two months ago. Although Apple was happy to give us a non-attributable briefing, we were disappointed that the company wasn't prepared to explain its position on camera."
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BBC News - Apple 'deeply offended' by BBC investigation