Carriers just can't seem to get around the walled garden. Every time a new technology promises to give consumers more choice in access -- be it Bluetooth, WiFi, or Ultrawideband -- carriers suggest crippling the extra access from the devices in order to protect their mobile data revenues. There is one problem with this strategy: There is little evidence that consumers who own locked-down handsets opt to use their carrier's network to transmit the data they have stored. Article