O2 Telefónica network coverage across Germany as of 2026

O2 Telefónica Germany Review: Coverage & Performance 2026

O2 Telefónica Germany delivers 99% population coverage, holds the highest 5G availability of any German carrier at 72.4%, and serves approximately 45 million mobile connections as of 2025. The network achieved a record score of 937 out of 1,000 points in the connect network test 2025, ranking second among all German operators. This review covers network performance, speed benchmarks, customer service, additional features, and a head-to-head comparison against Deutsche Telekom and Vodafone Germany.

Introduction

Telefónica Germany GmbH & Co. OHG operates as Germany's third-largest mobile network operator by revenue, trading under the O2 brand, covering 99% of the national population with 4G and 5G service, generating €8.5 billion in revenue for the 2024 financial year, and serving approximately 45 million mobile connections across all 16 German federal states, according to the Telefónica Deutschland Annual Report published February 2026.

O2 Telefónica stands out as the only German carrier to achieve the highest 5G availability score in Germany, with 72.4% of its users accessing 5G networks a majority of the time, according to the Ookla Speedtest Connectivity Report Germany H1 2025. The network earned second place overall in the Connect Network Test 2025 — the biggest quality leap of any mobile provider tested across Germany, Austria, and Switzerland — making it the strongest challenger to Deutsche Telekom's top position.

This article covers O2 Telefónica's 4G and 5G coverage percentages, city-level speed test benchmarks for Berlin, Munich, and Hamburg, customer service channels and satisfaction ratings, value-added features including eSIM support and international roaming, and a data-driven comparison against its two primary competitors: Deutsche Telekom and Vodafone Germany.

Compare Deutsche Telekom's network review and Vodafone Germany's full review for additional mobile carrier options in Germany.

Company Information And Background

Germany's O2 brand operates under the full legal name Telefónica Germany GmbH & Co. OHG, established in 2014 through the integration of E-Plus, and headquartered in Munich, Bavaria. The company is majority-owned by the Spanish telecommunications group Telefónica S.A., listed on the Madrid Stock Exchange (TEF) and the Frankfurt Stock Exchange (O2D), according to the Telefónica Deutschland Annual Report published February 2026.

Telefónica Deutschland generated revenue of approximately €8.5 billion in the 2024 financial year with around 7,800 employees across Germany, according to the Telefónica Deutschland Q1 2025 Results published May 2025. The company added a net 824,000 mobile contract customers in 2024 and 164,000 additional contract customers in Q1 2025 alone — growing faster than the overall German market.

Network Coverage And Performance

O2 Telefónica covers 99% of Germany's population with its mobile network, including 99% 5G population coverage — the highest 5G coverage figure among its core European markets — according to the Telefónica Group Annual Report published February 2026. The network operates approximately 28,000 active mobile sites across all 16 German federal states, including Bavaria, North Rhine-Westphalia, Baden-Württemberg, Berlin, and Lower Saxony.

Urban centres including Berlin, Munich, Hamburg, Cologne, and Frankfurt receive the densest 5G signal concentration, while a dedicated rural rollout programme added over 7,000 expansion measures in 2023 and over 1,600 upgrade measures in Q1 2025 alone, according to Telecompaper published April 2025. The connect network test 2025 specifically awarded O2 improved scores for rural areas and transport routes, according to the O2 Telefónica Press Release published November 2025.

4G And 5G Availability

O2 Telefónica delivers 4G (LTE) population coverage of 99% and 5G population coverage of 99% across Germany, with 72.4% of O2 users actively accessing the 5G network a majority of the time — the highest 5G availability figure of any German carrier — according to the Ookla Speedtest Connectivity Report Germany H1 2025.

The O2 network operates on LTE bands 3 (1,800 MHz), 7 (2,600 MHz), 8 (900 MHz), 20 (800 MHz), and 28 (700 MHz) for 4G coverage, paired with 5G NR frequencies in the 3.5 GHz (n78) mid-band and 700 MHz (n28) low-band spectrum, ensuring both high-capacity urban coverage and deep rural penetration. O2 operates its 5G network across more than 80 major cities and surrounding regions, including Berlin, Hamburg, Munich, Cologne, Frankfurt, Hanover, Nuremberg, Leipzig, and Stuttgart, according to the Telefónica Deutschland 5G Press Release published September 2021, expanded significantly through 2023 and 2025 rollout campaigns.

Speed Test Results

O2 Telefónica delivers a national average download speed of 77.4 Mbps and average upload speed of 15.0 Mbps across Germany, based on aggregated user-initiated tests published by TestMy.net as of May 2025. Telekom leads the overall market with a median download speed of 99.01 Mbps, while O2 records the highest 5G availability and made the biggest download speed gain quarter-over-quarter, according to the Ookla Speedtest Connectivity Report Germany H1 2025.

Learn more about 5G network performance in Germany for detailed technical comparisons across all three major operators.

Customer Service And Support

O2 Telefónica operates five primary customer service channels across phone, live chat, in-store, app-based support, and online community assistance. The carrier's Trustpilot score on the Telefónica Germany profile sits at 1.2 out of 5.0 based on 103 reviews as of March 2026, reflecting widespread dissatisfaction among reviewers, though this sample size is limited relative to the 45-million-connection subscriber base.

• Phone Support: +49 1805 57 57 57 — available Monday through Saturday, 8:00 AM – 10:00 PM (CET), and Sunday 10:00 AM – 8:00 PM (CET)

• Live Chat: Available via the O2 website and My O2 app, Monday through Sunday, 8:00 AM – 10:00 PM (CET), with an average first-response time under 5 minutes for chat interactions

• Physical Stores (O2 Shops): Over 350 branded O2 retail locations across Germany, concentrated in major metropolitan areas including Berlin, Munich, and Hamburg, plus thousands of authorized reseller points

• My O2 App Support: In-app ticketing and chat system available 24 hours a day, 7 days a week; the My O2 app is rated 3.8 stars on Google Play from over 200,000 reviews and 4.2 stars on the Apple App Store from approximately 85,000 ratings

• O2 Community Forum: Peer-to-peer and expert-moderated support at community.o2online.de, available continuously with indexed resolution threads

Compare all German carrier support options in the comprehensive carrier support comparison guide to identify which provider best matches your service expectations.

Additional Services And Features

O2 Telefónica provides these value-added services to subscribers across its O2 and partner brand portfolio:

• International Roaming: O2 offers EU roaming at domestic rates under the EU Roaming Regulation, covering all 27 EU member states plus EEA countries (Norway, Iceland, and Liechtenstein). Extended global roaming reaches over 100 countries across Europe, North America, Asia-Pacific, and Latin America through the Telefónica Group's international partnerships.

• My O2 App Features: The My O2 app delivers data usage tracking in real time, monthly bill payment and invoice download, plan upgrades and SIM management, 24-hour customer support chat, store locator with appointment booking, eSIM activation and management, and O2 More loyalty rewards tracking — seven distinct features accessible within a single interface.

• eSIM Support: O2 Germany fully supports eSIM activation on compatible devices including iPhone XS and newer, Samsung Galaxy S20 and newer, and Google Pixel 3 and newer. Subscribers activate eSIM directly through the My O2 app or via a QR code issued through the O2 website, requiring no physical SIM swap.

• O2 More Loyalty Programme: O2 More rewards subscribers with redeemable points earned on monthly plan spending, redeemable against Amazon vouchers, streaming service credits, and device discounts. Partnership benefits include discounted rates with Amazon Prime, Sky Deutschland, and selected retail partners.

• Family And Multi-SIM Plans: O2 Connect plans allow up to five additional SIM cards on a shared data allowance, with each additional line receiving a discounted monthly rate versus a standalone contract.

Discover more about eSIM activation in Germany and how to switch carriers without changing your number.

O2 Telefónica Germany Pros And Cons

O2 Telefónica Germany key advantages and disadvantages summary

Advantages

• Highest 5G Availability In Germany: 72.4% of O2 users access the 5G network a majority of the time — the highest 5G availability figure of any German mobile carrier, according to the Ookla Speedtest Connectivity Report Germany H1 2025.

• Record-Breaking Network Quality Score: O2 achieved 937 out of 1,000 points in the connect network test 2025, earning a "Very Good" rating for the sixth consecutive year and making the largest quality improvement of any operator tested across Germany, Austria, and Switzerland, according to Connect Magazine published November 2025.

• Widest 5G Geographic Reach: O2's 5G signal is live in over 80 cities including Berlin, Hamburg, Munich, Cologne, Frankfurt, Hanover, Nuremberg, Leipzig, and Stuttgart, supported by approximately 28,000 active network sites nationwide.

• EU Roaming Included As Standard: All O2 postpaid plans include EU roaming at domestic rates across all 27 EU member states, with no additional daily activation fee — a benefit codified under the EU Roaming Regulation.

Disadvantages

• Lower Average Download Speeds Than Deutsche Telekom: O2's national average download speed of 77.4 Mbps trails Deutsche Telekom's median of 99.01 Mbps — a 21.6 Mbps deficit — according to Ookla Speedtest Intelligence Germany H1 2025.

• Low Public Consumer Ratings: The Telefónica Germany Trustpilot profile scores 1.2 out of 5.0, based on 103 reviews as of March 2026, with recurring complaints about billing accuracy and contract cancellation processes.

• Upload Speed Lags Behind Download Performance: O2's national average upload speed of 15.0 Mbps sits noticeably below its download throughput, which affects users who regularly upload large files, conduct video calls, or use cloud-based backup services, according to TestMy.net aggregated data published May 2025.

O2 Telefónica Vs Competitors

Germany's mobile market operates under three infrastructure-owning network operators: Deutsche Telekom (T-Mobile), Vodafone Germany, and O2 Telefónica — plus the challenger operator 1&1, which launched its standalone 5G network in 2024. O2 holds a third-place position by average download speed but leads the market on 5G availability, making it the preferred choice for subscribers who prioritise consistent 5G access over peak download performance, according to the Ookla Speedtest Connectivity Report Germany H1 2025.

Deutsche Telekom delivers the fastest overall download speeds and ranks first in the connect network test 2025, making it the stronger option for raw performance-focused users. O2 Telefónica's advantage lies in 5G availability and aggressive customer acquisition pricing, attracting subscribers who prioritise consistent next-generation connectivity at a competitive contract cost. Vodafone Germany occupies a mid-market position, competing closely with O2 on speed metrics while trailing on 5G user availability.

Read the detailed O2 Telefónica vs Deutsche Telekom comparison or explore Vodafone Germany's full review for a complete alternative assessment.

Frequently Asked Questions

Does O2 Telefónica Have 5G Coverage In Germany?

O2 Telefónica delivers 5G population coverage of 99% across Germany, with 72.4% of its users actively accessing the 5G network a majority of the time. The network operates on 5G NR frequencies in the 3.5 GHz (n78) mid-band for high-capacity urban coverage and the 700 MHz (n28) low-band for rural and indoor penetration. 5G service is confirmed live in over 80 cities including Berlin, Hamburg, Munich, Cologne, Frankfurt, Hanover, Nuremberg, Leipzig, and Stuttgart, according to the Ookla Speedtest Connectivity Report Germany H1 2025.

How Fast Is O2 Telefónica's Mobile Internet Speed?

O2 Telefónica delivers a national average download speed of 77.4 Mbps and an average upload speed of 15.0 Mbps across Germany. Peak city-level performance reaches 89.6 Mbps download in Munich, 82.3 Mbps in Berlin, and 79.2 Mbps in Hamburg, based on Ookla Speedtest Intelligence data for H1 2025. O2 made the biggest download speed gain of any German operator quarter-over-quarter in the same period, according to the OpenSignal Germany Mobile Network Experience Report published November 2025.

What Areas Does O2 Telefónica Cover In Germany?

O2 Telefónica covers 99% of Germany's population across all 16 federal states, operating approximately 28,000 active mobile network sites. The densest coverage concentrates in Bavaria, North Rhine-Westphalia, Baden-Württemberg, Hesse, and the Berlin metropolitan area. Rural coverage improved significantly following 7,000 rollout measures completed in 2023 and over 1,600 upgrade measures executed in Q1 2025, with the connect network test 2025 specifically recognising improvements along transport routes and railway lines, according to Connect Magazine published November 2025.

How Do I Contact O2 Telefónica Customer Service?

O2 Telefónica customer service is reachable by phone at +49 1805 57 57 57, available Monday through Saturday from 8:00 AM to 10:00 PM (CET) and Sunday from 10:00 AM to 8:00 PM (CET). Additional contact channels include live chat via the My O2 app and the o2online.de website (daily, 8:00 AM – 10:00 PM CET), in-person service at over 350 O2 retail stores across Germany, and the peer-moderated O2 Community Forum at community.o2online.de, accessible at any time.

Does O2 Telefónica Support eSIM?

O2 Germany fully supports eSIM activation on all compatible devices, including iPhone XS and newer, Samsung Galaxy S20 and newer, and Google Pixel 3 and newer. Subscribers activate eSIM through the My O2 app using a QR code issued digitally, eliminating the need for a physical SIM card or store visit. eSIM management — including plan switching and multi-device profiles — is handled entirely within the My O2 app.

What Countries Does O2 Telefónica Roaming Cover?

O2 Telefónica includes EU roaming at no additional cost in all 27 EU member states plus Norway, Iceland, and Liechtenstein on all postpaid plans, under the EU Roaming Regulation. Extended international roaming covers over 100 countries through Telefónica Group's global carrier agreements, spanning North America (United States and Canada), Asia-Pacific (Japan, Australia, and South Korea), and Latin America (Brazil, Mexico, and Argentina). Roaming rates and data allowances for countries outside the EU zone vary by plan tier.

How Does O2 Telefónica Compare To Deutsche Telekom?

Deutsche Telekom leads O2 Telefónica on average download speed (99.01 Mbps versus 77.4 Mbps) and ranked first in the connect network test 2025, while O2 leads the entire German market on 5G availability at 72.4% versus Telekom's approximately 68%. Both carriers deliver 99% national population coverage and include EU roaming on all postpaid plans. O2 ranked second overall in the connect network test 2025 with 937 points, recording the largest quality improvement of any operator tested across the DACH region, according to Connect Magazine published November 2025.

What Is The Best O2 Telefónica Feature?

O2 Telefónica's strongest feature is its market-leading 5G availability, with 72.4% of subscribers accessing 5G a majority of the time — the highest figure of any German carrier. This advantage derives from O2's early and extensive 5G NR deployment across both the 3.5 GHz mid-band and the 700 MHz low-band spectrum, giving the network simultaneous high-capacity urban performance and wide-area rural 5G reach. The 5G availability leadership is confirmed by the Ookla Speedtest Connectivity Report Germany H1 2025.

Conclusion

O2 Telefónica Germany delivers Germany's highest 5G availability at 72.4%, 99% national coverage, and a record connect network score of 937/1,000 — making it the top choice for 5G-first subscribers and value-driven postpaid users. Visit o2online.de to compare current plan options or check your area's 5G coverage directly.

Explore more German mobile carrier options through the complete Germany carrier directory or learn how to choose the right German mobile carrier for your needs.

Last Updated: March 31, 2026

Sources:

1. Ookla Speedtest Connectivity Report — Germany H1 2025, published October 2025

2. OpenSignal Germany Mobile Network Experience Report, published November 2025

3. O2 Telefónica Connect Network Test 2025 Press Release, published November 2025

4. Telefónica Deutschland Annual Report 2025, published February 2026

5. Telefónica Deutschland Q1 2025 Results, published May 2025

6. Trustpilot — Telefónica Germany GmbH & Co. OHG Customer Reviews, accessed March 2026

7. O2 Telefónica Germany Official Website — o2online.de

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