5G networks will provide vastly increased capabilities over 4G networks. 5G is expected to deliver peak data rates of up to 10 Gbps, end-to-end latencies of 1 ms or less, connectivity for at least 1 million devices per square kilometer, and network energy efficiency improvements of up to 90%. However, 5G networks are still in development and large-scale commercial deployments are not expected until around 2020. In the meantime, 4G networks are being enhanced through technologies like LTE-Advanced, VoLTE, and WiFi calling to help meet some 5G requirements and enable new applications and use cases.