but i did find this though. it's how to update your phone's PRL if you are on US Cellular.
http://www.uscellularforums.com/current-news/new-prl-update/?wap2 ...don't know how old the posts are, but i've searched key words "us cellular prl update" in google and i got a few references that you dial *228. you may want to check with your carrier how they update your phone's PRL.