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by CGamesPlay 2185 days ago
Yes. For example, webpages viewed in Safari are sandboxed. You can't run arbitrary code to affect parts other webpages. So they had to break out of that.

All apps, including Safari, are sandboxed. Apps can't run arbitrary code to affect other apps. So they had to break out of that.

The system itself is sandboxed. Restarting the phone resets it, in many ways, to a "known" state. So they had to install something that would persist across rebooting the phone.