What are the 3G Bands. Unlike 2G networks which are being phased out across the world, 3G is still here and as time passes it may also be phased out due to the growth in the 4G and 5G networks globally. 3G is third generation wireless mobile telecommunications technology which was the upgrade from the 2G bands. The 3G networks have higher speeds such as having transfer rates of at least 200 kbit/s.