To update the PRL, hold down the Option Key and select the signal bars from the menu and select Activate Card.You can also update the PRL on Verizon or Sprint by dialing a *22899 from your phone or PC Card.For Sprint, it is ##873283# (it is also possible to use code ##72786# on Android or ##25327# on i OS to completely clear out the service programming and redo OTA activation, which includes updating the PRL).
For instance, upgrading the roaming capability on your phone will help prevent dropped calls and improve the call quality.
Updating the roaming capability is done the same way for every Verizon phone.
With a few clicks of your dial pad, your phone will be updated.
You may be in an EVDO area, but if your card doesn't have the tower in the list, it won't know to attempt to connect to the new tower!
Your EVDO modem does automatically "know" to add new towers to its PRL, so it is highly recommended that you manually update your PRL monthly so that you can ensure that your EVDO device is always able to connect to the currently available EVDO towers.