How to change APN?

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I've switch to a new carrier and they do not support my LG Quantum. The phone and text works perfectly, but I was told I need to change the APN settings in order to get the 3G to work. I've searched, but unable to find how to change my APN.

*EDIT:
I have resolved my problem. I used the MFG app to change the APN, but the thing that gave me trouble was the carrier provided me with the wrong APN settings. After entering the correct APN setting it was like the flood gates opened and my phone came alive with several alerts!

APN

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可以去SYSTEM/ETC中找到apn.conf..里面是apn接入点设置。。。

There is also a specialized app for this kind of stuff named "Network Setup". It is available in the "LG Apps store".

It will make most of the setup for the selected operator.