APN for Handy Karte talk & data SIM: data.otelo.de Website in German only: http://www.otelo.de Blau (on O₂) Blau used to be a MVNO of eplus and made a relaunch in 2015 as a subsidiary and secondary brand of Telefónica. Blau uses the network of O2 in 2G and 4G/LTE up to...