The Dutch phone giant Odido is the latest phone and internet company to be hacked in recent months, as governments and financially motivated hackers continue to steal highly confidential information about phone customers.

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The Singaporean government said the China-backed hackers gained "limited access to critical systems" run by the country's top four telecommunication giants, but said they did not disrupt services or steal customers' data.

More than half-a-million people who bought access to phone surveillance and social media snooping apps had their email address and partial payment card numbers published online.