The difference between 3G and 4G is the speeds that the Internet can reach, and the methods they use. The carriers that supposedly offer 4G but don't ar
e LTE, WiMax, and UMB The carriers that do offer 4G are Verizon, AT&T, T-Mobile, and Sprint
http://www.differencebetween.net/technology/difference-between-3g-and-4g/