Austria has three mobile network operators: Drei (3), T-mobile and A1, which operate on the standard European frequency bands: 800, 900, 1800, 2100 and 2600MHz.
Drei (3) AT.
Drei AT B8 4G speedtest showing 3MHz paired Bandwidth on Drei AT.
Drei AT Band 7 speedtest demonstrating the 20MHz paired carrier.
Carrier aggregation (CA) on Band 3 (15MHz) and Band 1 (10MHz) on Drei AT. Sometimes 20MHz is used on B3.
A speedtest of the Band 3 and Band 1 aggregation.
A1 Telecom Austria
A1 Austria has a 20MHz carrier on Band 20, capable of providing very good speeds even in slightly sub optimal conditions.
Their other standard layer is B7 20MHz.
Band 20 and Band 3 CA on T-Mobile AT.