Sprint has issued PRL 10027 for over-the-air updating. Call *2 and ask to be flagged for the update.
This is not to be confused with the 20007 PRL for EV-DO data devices. Sprint initially (and incorrectly) referred to the 20007 PRL as version 10027. PRL 10027 is for non-EV devices (in other words, all devices other than the Sierra AirCard 580).