A group of researchers from Purdue and the University of Iowa have discovered a number of vulnerabilities affecting the 4G LTE networks that could be exploited by attackers. The experts detailed ten different attacks in a paper, the experts leverage weaknesses in three critical protocol operations of the cellular network, such as securely attaching a device to 4G networks and maintaining a connection to receive calls and messages. The researchers devised a testing framework dubbed LTEInspector that they used to detect vulnerabilities in LTE radios and networks and tested eight of the ten attacks using SIM cards from four large US carriers.”]
Source: http://securityaffairs.co/wordpress/69852/hacking/4g-lte-networks-flaws.html