If your downloading the .prl file than that's it you don't need to open it.
The next step will be to find someone to put your iphone on the Metro system you may find someone on ebay that can still do this but last I heard Metro ceased this service on 12/31/12.
Good luck!
Then the flash is the next step, if using iphonecdmatool there is a step by step tutorial posted on their site.
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