To my knowledge 411 dials to the carriers "Information" they have set up. I don't think there is anything in the PRL that affects information.
PRL is simply a text file that tells the phone what towers to look for.
All the features such as call waiting, information, caller id, etc. are set up through the carrier and it is determined by them if you have that particular feature.
At least that is my take on it.
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