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Welcome to Tech News Briefing. It's Thursday, December 19th. I'm Danny Lewis for the Wall Street Journal.

Every Apple iPhone made in the past few years includes a tool that could help protect people targeted by cybersecurity threats.

It's called lockdown mode, and it's used by human rights activists and journalists. But it could be useful for just about anyone. Just ahead, we'll hear how the tool

works and how it could help you. And later, TikTok's future in the U.S. is uncertain, but right now,

it still has a huge audience of young people who get their news from the social media app.

And many legacy media companies are experimenting with using TikTok to reach new audiences.

WSJ reporter Isabella Semenetti explains why news companies are still putting time and energy into TikTok despite its potential ban.

But first, hackers looking to break into smartphones have a number of tools to do so.

Photo sharing, payment applications, and logging on to unsecured Wi-Fi networks are all

ways that bad actors can exploit to install spyware.

But in recent years, Apple has introduced a tool to help protect against cyber attacks

by locking down some of the iPhone's most commonly used features.

It's called Lockdown Mode.

And Jackie Snow wrote about it for the Wall Street Journal.

She joins us now.

Jackie, is this something that could be useful to anyone?

People should go ahead and try it.

It's under privacy and security in settings, and you can turn it on. And I actually had a

cybersecurity expert tell me that if you were, you know, maybe part of a password leak or maybe

...