Upvote:7
There is no option to get a refund on unused travel. There is a mobile payment system, but it requires you to provide your bank account and authorize direct debit. Weekly tickets are not all that expensive and are valid across all means of public transport (bus, tram, U-Bahn, S-Bahn) A weekly tickets for zones A and B costs around 30 Eur. https://shop.bvg.de/index.php/group/63 https://shop.bvg.de/index.php/group/73