Without a PRL, the device may not be able to roam, i.e. There may be cases where missing or corrupt PRLs can lead to a customer not having service at all.
On many networks, regularly updating the PRL is advised if the subscriber uses the device outside the home area frequently, particularly if they do so in multiple different areas.
As cellular carriers add and move towers, merge, divest and otherwise reconfigure their networks, the PRL information in your 3G PC-Card modem can get out of date.
Because roaming agreements are constantly changing and new towers are added all the time, it's important to keep this list up to date.Originally Posted by diamondprincessxoo I didnt do it yet...in a few minutes im going to try that and ill let you know.This allows the phone to choose the best roaming carriers, particularly "roaming partners" with whom the home carrier has a cost-saving roaming agreement, rather than using non-affiliated carriers.PRL files can also be used to identify home networks along with roaming partners, thus making the PRL an actual list that determines the total coverage of the subscriber, both home and roaming coverage.