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Is there any android smartphone commercially available that is already rooted by default, so that no rooting procedure is required?

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No, There is no phone with root access pre-built but there are phones like oneplus with cyanogen OS.

I hope these links may help you reguarding this topic.

http://www.makeuseof.com/tag/why-doesnt-android-come-rooted/ http://www.androidauthority.com/sell-android-devices-already-flashe-119002/

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