Remember that problem Galaxy Nexus devices were having on Sprint where owners couldn't get any connection to any data network at all? Well, if you happened to be one of those owners, how could you forget? Worry not, though! Sprint just announced it will be rolling out a fix over "a 1-2 day period."
You'll need to be connected to a WiFi network to do anything (though this shouldn't be new to you if you're affected by this problem).