4G stands for fourth generation of mobile telecommunications technology, which is the successor to 3G (third generation) technology. 4G offers faster data transfer speeds, improved network reliability, and more efficient use of the available spectrum compared to 3G. This enables faster internet access, smoother streaming of video and audio, and improved video calling. Some of the common 4G LTE (Long-Term Evolution) network frequencies include 700 MHz, 1700 MHz, and 2100 MHz.