Hi
I am trying to upgrade my DSL tariff but It is impossible to do this from my customer account. Does anyone have an idea how to do this upgrade? I also try calling to the customer service line, but no one answer. There is any customer email to request this upgrade?
Thank you
edit by Thomass3 : Question moved from “dig. Wohnzimmer” to “English O₂ Community: Broadband / DSL“