Ok, so it seems that Simply, also on prepaid, still has some contract involving the Schufa, like Easymobile and Klarmobile. I correct the pages at once.
For me Simyo/Blau/Debitel-Light (all identical) are still better than Aldi for cheaper SMS prices, which counts more than just 1 cent/min more for voice calls, since I have no German friends with Aldi, but mainly with e-plus or O2.
Snaimon do you think that Blau and Simyo will get together soon? And what about Debitel? Another identical offer... they don't have much sense!
P.S. I should come to K?ln around Easter holidays, I hope we can arrange a meeting with Triband81!