After some searching I have found that this device is 3G ONLY. This means you can attach a SIM card, but the maximum connection speed you'll get in a full supported section will be 3G. For 4G another device that has support for 4G networks is required. You will have to visit a local modem seller to buy one that has 4G capability. There is no tweak or firmware update to make this device compatible with 4G networks.