T-Mobile USA, Inc. and Samsung Telecommunications America today unveiled the new T-Mobile Sidekick® 4G™ by Samsung. The new Android™-powered smartphone pays tribute to its heritage with its stylish good looks and a killer keyboard while redefining messaging and upgrading to 4G speeds. One of T-Mobile’s fastest smartphones running on America’s Largest 4G Network™, the new Sidekick 4G is capable of delivering theoretical peak download speeds of up to 21 Mbps.…