Someone sent me a Private Message asking how to tell which version of PRL you have on your Blackberry device. Dial #4357* and press Send and it will display some information about your phone. The PRL version is part of the way down that list. I believe right now, the range (depending on where you live) is from 51910-51926. Mine, in Mississippi, is 51926. You can always make sure you have the latest PRL by dialing *228 and using option 2.
You might ask, Doc, what the heck is a PRL. It stands for Preferred Roaming List. For more information, go to http://www.roamingzone.com/prl/ and they give a good description. I hope this helps some of you.