4G is here, or more accurately LTE implementations (another way of saying 4G) are being trialled and will be rolled out more widely in the UK in the near future. One of the changes in LTE networks is the use of IP for all communications between components, this improves scalability but does it also increase the risk of successful compromise? MWR have been working with a number of major players in this space and have gained significant experience in the technology, learning how it can be security tested and ultimately how it should be secured. This talk will provide an overview of the security of 4G networks and more importantly how they should be tested. From this talk the audience will take away a better understanding of LTE deployments, how they could be attacked and how we can gain assurances about their security.