Picked this off of the RV NET forum and thought I would share it here.
For those with a Verizon aircard or a USB cellular modem..... Have you updated your PRL version in the last month or so?
Not to do so is a mistake. Basically, your aircard has a list of Preferred Roaming List (or PRL) embedded in the card. This list tells your card which towers to look for when establishing connection. As new EVDO towers are installed, your PRL will be out of date and you may be in an EVDO area, but your card doesn't have the tower in the list, so the tower is invisible. So, it is a good idea to update your PRL monthly.
For those with any Verzion provided aircard you can update your aircard by using Verzion's VZAccess Manager software. Start VZAccess Manager but do not connect.. now, go to "Options". Now, select "Activation" and re-activate your aircard. Only takes about 30 seconds or so. Does all without any input from you. By the way some aircards supposedly do PRL updates automatically... key word supposedly. Only takes a minutes to do a reactivation to be 100% sure your PRL is current. Remember, those using their aircard or USB cellular modem inserted in a router, this means every month or so remove the aircard from the router and plug it directly into your laptop and do as I mentioned above and then reinstall the aircard in the router.
Frank
