In a number of European countries and elsewhere on the planet, a number of network operators have rolled out LTE-Advanced Carrier Aggregation in recent months. Most of them bundle a combination of 10, 15 or 20 MHz carriers. In Germany, the first mobile network operator has now also started Carrier Aggregation and has gone straight to the maximum that is possible today: Two full 20 MHz carriers for a theoretical top speed of 300 Mbit/s with LTE Category 6 devices.
Nicely enough, the carrier has also enhanced it's publicly available network coverage map to show where 2×20 MHz CA is available (click on the LTE 300 Mbit/s checkbox). When you are on the nationwide zoom level there's not much to be seen. But when zooming into the map over big cities such as Cologne, Düsseldorf, Berlin and many others, you can see that these are quite well covered already. I'm looking forward to the first reports by the tech press how much can be achieved in practice.