My experience with O2 is mixed. In the city the data is fast and reliable and the price is hard to beat, but visiting my parents in the countryside the signal becomes unusable. It really depends on where you spend your time, so I can't give a clear thumbs up or down.
Fast in cities, good pricing
Weak rural coverage
My O2 contract silently auto-renewed for another term right when I intended to leave, and untangling it meant repeated calls and emails that went in circles. Being locked in like this without a clear reminder feels deliberately customer-unfriendly. Left a very bad taste despite the affordable plan.
Silent auto-renewal, painful cancellation
O2 has been excellent for my life in Berlin, with quick 5G data, generous allowances, and a price that undercuts the bigger names. Switching my number over through the app was simple and worked the same day. For urban users this is a genuinely smart pick.
Fast 5G, generous data, easy switching
O2 from Telefonica Deutschland offers some of the most affordable mobile plans I've found, which is great for my budget. The catch is coverage, which drops out on certain train routes and inside some buildings. I'm genuinely torn between the low price and the inconsistent signal.
Very affordable plans
Patchy coverage on transit and indoors
O2 by Telefonica Deutschland delivers brilliant value, I get loads of high-speed data each month for far less than I paid elsewhere and the coverage where I live and work is rock solid. The app makes managing the plan effortless. Couldn't be happier with the switch.
Outstanding data-for-price, solid local coverage