I have memories of speaking English to O2 in the past - but maybe I misremember.
Today, in response to the question "Can you connect me to someone who speaks English?" - the answer from the customer care rep on the phone was "No".
(issue remains of course so any hint on how to receive customer support in English would be very welcome!)
Lösung von o2_Lars
since this is still a topic that many people are interested in I will try to keep you up to date with the situation as of today (02/2020).
You will be able to reach an english speaking agent from 7AM to 8PM on weekdays and 8AM to 6PM on saturdays trough our hotline, there is no special number to call.
Since we can not provide an english service on every topic it is still necessary to have a german speaking person with you if for example you would like to report a technical DSL issue.