How can I root or unlock a mobile and what does it mean?

Joop Gobes January 19, 2013
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What is rooting or unlocking a mobile. How to do this?

I have bought a Lenovo A789t in China running Android 4.0. It accepts China mobile SIM and China Unicom SIM cards. Does this means it’s unlocked or still locked, except for these 2 providers.

I will travel to New Zealand and Europe and really need an unlocked phone. Can I unlock it myself or have it done by someone?

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