Despite that they are still regarded as one of the least bad telcos because their customer service sucks much less than that of their competitors (e.g. Telefoni

Despite that they are still regarded as one of the least bad telcos because their customer service sucks much less than that of their competitors (e.g. Telefonica O2, which is a large one, was basically impossible to contact for most customers for months at a time because of "technical difficulties"). Their mobile network is comparably good and all in all they are seen as the premium option on the German market.