What Do You Need For 4G? To access 4G, you just need a 4G compatible device which now includes most current generation phones. You also need to make sure that you have a sim card that is suitable for 4G. Before you invest in the services of a provider, make sure that it is available in your area. 4G is still not available in every area across Ireland, and more rural areas may struggle to get the advertised speeds. You can also access 4G through a dongle that can be connected through a system or device like a laptop to gain the same type of connection.