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This brings up some legal issues and a warranty loss. Is it necessary to jailbrake the iOS device first as written in If yes, which is the safest way that you would recommend?

Yes, there is no way to kill safari or clear the caches without a jailbreak. I can't speak to the safety of any particular jailbreak or even the availability of a jailbreak for any given version of iOS. If it concerns you then your best bet is to only do device testing on Android.
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