Downloaded and ran the Roaming patch. It fixed the problem of dropping calls. However, now when calls connect there is no voice connection on either end. When I use my 650 to call my wife's 600, both phones show a connection but no sound can be heard from either phone. When I reverse the call the other way, I get the same thing. Both phones show a connected call but no sound. Voice mail and external calls do the same thing --- connected but no sound. I am in Telluride which may present some unique problems. I believe the local carrier here is Alltel. Sprint is baffled and says they have not heard of this complaint. They recommended a hard reboot and reload the patch. Did not work. I'm hoping there are some others out there.