Talk:Germany/@comment-186.81.235.38-20160128161915/@comment-24682153-20160129201937

You may check these links:

http://www.tripadvisor.com/ShowTopic-g187323-i135-k5606284-o10-Prepaid_SIM_Cards-Berlin.html

https://www.tripadvisor.co.nz/ShowTopic-g187323-i135-k8128071-SIM_card_purchasing-Berlin.html

At Hauptbahnhof you can get the SIM cards of the network providers (Telekom, Vodafone, O2). They have stores there. For cheaper SIMs you need to go to a supermarket (for their own branded SIMs), petrol/gas station (usual big choice in the larger places) or certain kiosks (for Lebara or Lyca). As the central station is not exactly "downtown", you will not find them there.

Remember that you can't use the SIM right away. You need to register online first. The network stores often don't help you with that. You need to have a free open WIFI like in McDonald's to fill out a German form on the website of the provider and need to wait some minutes or hours for your SIM to be activated.