In ascending numeric order: • 1 Telering was bought by T-Mobile in 2005. As of 2006, Telering uses the network-infrastructure of T-Mobile. As a special requirement of the European commission, many of the former transmitters and frequencies previously operated by Telering were given to Orange and Drei. • 2 BoB is a discount service of A1. yesss! was a discount service of Orange, now sold to A1. Eety is a discount service of Orange (now 3). Due to
Mobile number portability, the code is not an accurate way to determine the provider of a mobile phone number. The providers assign only in exceptional cases (special sort of custom numbers, more expensive) non-existing numbers with a different prefix, and this is handled similarly to porting an existing number from the desired network. However, the providers still have administrative sovereignty over their own prefixes. == Special/Service codes ==