The key with beta testing any software is that your test group have a bunch of "real world" devices with an enormous variation of settings, and installed applications. Apple can test the OS on their lovely clean lab devices til they're blue in the face, but the key phase is when the OS starts to get out to developers who have other stuff installed - music, films, apps, random combinations of settings, real life notifications, different carriers worldwide - that's when the OS really gets a proper test.




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