recommends a press release over at the EFF on their recent court victory affirming that cell phone location data is protected by the Fourth Amendment
. Here is the decision
(PDF). "In an unprecedented victory for cell phone privacy, a federal court has affirmed that cell phone location information stored by a mobile phone provider is protected by the Fourth Amendment and that the government must obtain a warrant based on probable cause before seizing such records. EFF has successfully argued before other courts that the government needs a warrant before it can track a cell phones location in real-time. However, this is the first known case where a court has found that the government must also obtain a warrant when obtaining stored records about a cell phones location from the mobile phone provider."