[dknlght]

I've had this issue Not sure what the cause but I assumed it was after loading the gps and losing my MSID information. when ever i roam I got the verizon unable to authenicate message. Found the solution on xda and posted it on here a month or so ago. Generally you have to call sprint tech support and ask them to do an HLR reload for you. My friends and I who all had the issue called them and had them do that and it fixed it for us. FYI the usual tech support didn't seem to know about it They thought it was a problem with the service in my area but my brother had the same phone no updates since he got it and roaming works fine. I called again asking for the HLR Reload they sent me to second tier tech support which was able to do this.