FACT · DE MVNO
About Blau
O2-owned German MVNO offering postpaid Allnet flat plans on the Telefonica network.
Key facts
Type
MVNO
Headquarters
Munich, Germany
Founded
2005
Acquired by O2
2018 (from Drillisch / 1&1)
Parent
Telefonica Germany (O2)
Host network
O2 / Telefonica
Cheapest plan
Allnet S Flex - EUR 7.99/month for 20 GB
Contract
Flex (monthly) or 24-month
5G
Yes
eSIM
Yes
Audience
Value postpaid customers
Official site
blau.de
What is it?
Blau is a German MVNO launched in 2005 and acquired by Telefonica Germany (O2) in 2018 from Drillisch / 1&1. Since acquisition, Blau has run as an internal O2 sub-brand on the O2 4G and 5G network, positioned as the digital postpaid value brand alongside O2 (premium), otelo (Vodafone-network sister), and ALDI TALK (prepaid).
Blau's flagship tariff is Allnet S Flex at EUR 7.99/month for 20 GB on a Flex contract (monthly rolling). Postpaid plans with longer commitments scale up to unlimited data. 5G access is included on every tariff that supports it. eSIM activation is available.