US carriers can all collectively breathe a sigh of relief today: Californias mobile kill-switch bill is dead, at least for now. The would have required all smartphones sold in the state to include a remote-kill feature designed to render stolen phones useless. The bill was designed to curb phone robberies by making the crime less lucrative. If carriers didnt comply, the state would have been able to fine them $2,500 for every unsupported device sold.