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PRLs are pretty worthless in most areas. The phones will find the towers regardless if you have an older PRL or not. All they are are literally prioritized lists of towers you should roam from first [prl=preferred roaming list]. If you keep your phone on Sprint Only, they do nothing. Every PRL update just includes a new roaming agreement Sprint has entered with a company in a specific area. Unless you live in this specific area, it doesn't help you any, and even if you do, for the most part it just saves Sprint money to roam on X tower before Y tower.
That being said, sometimes if they become corrupt, you will have tons of problems with calls dropping or not establishing correctly.
I don't quite understand your question akijikan?
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