Hi. My name is TracFone Michael and I will be addressing your question. PRL update is synchronized with phone activation, phone number change, or when you roam outside of your home area. In the event that the PRL is not successfully updated, then it needs to be manually done by dialing *22891 on your TracFone. I believe this answers your question. It's been a pleasure helping you. Have a good day.
TracFone - Michael