When it comes to smartphones and wireless data services, 4G" target="_blank">http://hothardware.com/tags/4G.aspx">4G is definitely one of the hottest features today. And while various wireless service providers are touting their 4G networks and upcoming plans for 4G, there are still a relatively small number of smartphones that actually support 4G technology and can take full advantage of the speed boost and other advantages 4G provides. The latest 4G device from T-Mobile is the Samsung Galaxy S 4G. This phone works on T-Mobile's HSPA+ 4G network, which uses a different technical standard than Sprint or Verizon Wireless' 4G networks. According to T-Mobile, the Samsung Galaxy S 4G is the wireless carrier's first smartphone that is capable of delivering theoretical peak download speeds of up to 21 Mbps while in one of T-Mobile's 4G coverage areas. With these speeds, T-Mobile says you'll be able to enjoy mobile HDTV through T-Mobile TV as well as video chat via Qik.