There exist 4 main porviders in Germany:

  • T-mobile
  • Vodafone
  • E-Plus
  • O2

Cheap sim-cards:

for example:

  • Simyo (0,09 €/minute or text)
  • WhatsAppSim (0,09€/ minute or text, free whatsapp)
  • Congstar (0,09€/ minute or text, 0,24€/MB)
  • ....

But you can get an overview here

 

If you go to a supermarket there is also the possibility to buy the phone card at the cash desk. Every supermarket offers its own tariff.

for example: