The primary difference between LTE CAT 1 and CAT 4 is the data rate. Where CAT 1 provides a 10 Mbps downlink and 5 Mbps uplink, CAT 4 allows for a maximum of 150 Mbps downlink and 50 Mbps uplink. Both of them work on the same 4G networks. CAT 4 can work with large data volumes, whereas CAT 1 is a cost-effective solution for medium amounts of data.