If you search for a place here, you can see the price for the single region and the region bundle underneath it should be free of charge. Here is an example using the city of Berlin. If you are logged in and have an active voucher code, you will see that the Berlin is subject to charges, but the region bungle "Berlin-Potsdam-Havelland" is free. You can do this with any region bundle of your choice by entering a city in the search field.
O2 voucher campaigns
If you are an O2 customer, you can participate in their current voucher campaign. This campaign allows you to receive up to 3 vouchers for one region bundle each. For more details read the article under Gratis Regionen-Pakete bei komoot.
You only receive one voucher per day. You can activate this voucher by clicking the button "Redeem voucher" on our website. After that, one regional bundle is available for free.