German carrier Deutsche Telekom announced today that it will be launching LTE+ — otherwise known as LTE-Advanced, capable of doubling LTE speeds to up to 150Mb/second — as an addition to its network, fueling speculation regarding iPhone 5S LTE-Advanced capability. In the announcement, the company notes that Samsung will offer a Galaxy S4 with LTE-A, while also claiming “comparable devices from other vendors will follow at the end of…