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How Do I Prepare My Phone for a Protest?
(themarkup.org)
This is a most excellent place for technology news and articles.
Ask a non-protesting friend or family member to take it with them about their daily routine?
I'm sure my mum would be happy to look after my phone for a day if it meant getting one over on the authorities. And if anyone asks, I'm just a good son who likes to hang out with his mum.