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This question already has an answer here:

So I can use Twitter. It is okay when I use WiFi. But in 3G I cannot change DNS.

marked as duplicate by eldarerathis Dec 8 '14 at 22:30

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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If you are on Jelly Bean (MR2) or KitKat, you can use my app: Override DNS for KitKat. For lower versions of Android there are tons of free apps which do the same.

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