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But they main detain you for a bit or take your phone. If you are not a US citizen, things get murkier.
If you are worried, I would sign-out of anything sensitive, then delete the app. Transfer any sensitive data/files to another device at home, then hard delete those items.
If you're really worried, leave your main devices at home and buy a "travel" phone that is clean.
That's what they advise you to do when visiting China. 
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