4G and LTE devices and network expansion announcements are all the rage at CES this week. T-Mobile is not one to be left out of the fray. Today T-Mobile unveiled plans to double the speed of its 4G network this year, which will be capable of delivering peak download speeds of up to 42 Mbps. Moreover, the company announced that in 2011 it will launch at least 25 new 4G devices, starting with its first 4G tablet — the Dell™ Streak 7, expected to be available at T-Mobile stores across the country in the coming weeks. The company vowed to aggressively expand and evolve its 4G smartphone portfolio, launching additional devices capable of delivering peak download speeds of up to 21 Mbps in the first half of 2011, and smartphones capable of delivering peak download speeds of up to 42 Mbps in the second half of the year.