yes, your prl can effect the quality of your signal. I have been involved in situations where simply reloading the same prl fixes odd dead spots.
the prl is a indexed list of towers.. if there is data corruption somewhere when it's loaded, then the whole index is out of wack. it will still work because it's designed that way, but a clean file works better.
edit I knew I mis-spoke slightly, but for clarity sake
Quote:
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The PRL is a list of information that resides in the memory of a digital phone. It lists the frequency bands the phone can use in various parts of the country. (The smaller bands within Cellular or PCS.)
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http://www.phonescoop.com/glossary/term.php?gid=11