There are many wonderful things about living in California, but freeway driving isn't one of them. The best strategy is to have a great sound system and a cell phone handy. Either one helps to pass the time while you wait and wait and wait and wait to get to an exit that's the one you intended to use or close enough to provide a route around the freeway.
ATT Wireless implemented a limited deployment UMTS network in the US last year. The only devices announced by ATTWS were the Motorola A845 and the Nokia 6651. Here are the devices and the 3G coverage map from ATTWS.