I have prepaid, so I pay exactly nothing if I don't use it. I usually buy 50MB (yes, that's MB) for one month for 1,99€ but most of the time 50MB is too much for me. My last three months were 25MB, 45MB and 14MB.
@musicmatze Seriously though I could probably use way less mobile data by connecting to public WiFi and home broadband more but it's just so convenient having data everywhere. I only use about 5GB/mo usually which is way less than others.
@tilduke no, not at all. I usually chat with people while on data, sometimes toot a bit or check the bus plan. Not more. At home or at work I have wifi, at some bus stops also. No need for a "real" data plan at all 😄