FACT · GERMANY-TURKEY MVNO
AY YILDIZ
Updated May 14, 2026 · By Jules de Bruin · Germany's specialist Turkish-diaspora MVNO on the O2 network.
Updated May 2026. AY YILDIZ is a Telefónica Germany-owned MVNO launched in 2005 to serve Germany's ~3 million-strong Turkish-origin community. It runs on the O2 / Telefónica network, ships Turkish-language customer service, and tunes its rate cards around Germany-Turkey calls. Prepaid tariffs start at EUR 3.99 per 4 weeks, with several sub-EUR 10/month tiers. The flagship Ay Allnet Plus contract delivers 90 GB for EUR 17.99/month with 5G up to 50 Mbit/s.
What is AY YILDIZ?
AY YILDIZ ("Star and Crescent") is a German mobile virtual network operator launched in 2005 by E-Plus and now operated by Telefónica Germany. It rides the O2 radio network but is positioned as a diaspora brand for Germany's Turkish-origin community, with Turkish-language support and Turkey-tuned tariffs that mainstream O2 sub-brands do not offer.
The brand was created when E-Plus identified that Germany's Turkish-origin population - the country's largest single foreign-origin group, estimated by the Federal Statistical Office at around 3 million people - was underserved by generic German tariffs that charged premium per-minute rates for calls to Turkey. After Telefónica acquired E-Plus in 2014, AY YILDIZ was retained as a specialist sub-brand inside the O2 family alongside BLAU and Ortel Mobile.
Three things still differentiate AY YILDIZ from generic O2 MVNOs in 2026: Turkish-language customer service by phone and live chat, Germany-Turkey rate cards tuned below mainstream per-minute rates, and retail distribution through kiosks, ethnic supermarkets, and money-transfer shops in Turkish neighbourhoods of Berlin, Cologne, Frankfurt, Hamburg, and the Ruhr.
Key facts
The data points below are the citation-ready summary of AY YILDIZ as of May 2026. Pricing is taken from the operator's own published tariff pages; verify the live page before publishing any commercial figure.
How do AY YILDIZ Turkey calling tariffs work?
AY YILDIZ sells two parallel product families - prepaid Ay Allnet bundles billed every four weeks, and the Ay Allnet Plus postpaid contract. Both come with Turkey-optimised options: included or low-rate minutes to Turkish landlines, and per-minute add-ons for Turkish mobile networks (Turkcell, Vodafone Turkey, Trk Telekom). German destinations are flat-rate inside the bundles.
The prepaid ladder is the entry point and the reason the brand keeps a sub-EUR 10/month footprint. Tariffs run on 4-week billing (13 cycles a year, not 12), and the lower three steps stay under EUR 10 per cycle:
- Ay Allnet S - EUR 3.99/4w. Entry tier aimed at light users who mainly want German allnet minutes and a small data bucket.
- Ay Allnet M - EUR 4.99/4w. Adds more data and is usually the cheapest tier where Turkey-landline minutes start being included.
- Ay Allnet L - EUR 9.99/4w. The most popular prepaid step, sitting right under the EUR 10 threshold with the typical Turkey-landline allowance and a useful 4G/5G data pot.
- Ay Allnet XL - EUR 14.99/4w. Heavier data, more Turkey minutes.
- Ay Allnet XXL - EUR 19.99/4w. Top prepaid tier; closes the gap to the Ay Allnet Plus contract.
Postpaid moves the user onto Ay Allnet Plus at EUR 17.99/month for 90 GB, with a stronger Max tier at 180 GB (verify current price before publish). Both tiers run on the O2 network with 5G up to 50 Mbit/s, EU roaming under RLAH, and the same Turkish-language hotline as prepaid.
Where it appears on SimCompare365
AY YILDIZ is indexed across the German hub and surfaces in international-calling and Turkey-specific comparisons. It sits next to Lebara Germany, Lyca Mobile DE and Ortel Mobile in the diaspora bucket.
Sources
Pricing and product structure are taken from the operator's own tariff pages; ownership and host-network status are from Telefónica Germany's public brand portfolio.
FAQ
Which network does AY YILDIZ use?
AY YILDIZ runs on O2 / Telefónica Germany. Coverage, 5G availability and speed caps mirror what O2 sells under its own brand, with the operator capping AY YILDIZ 5G at up to 50 Mbit/s.
Who owns AY YILDIZ?
The brand is wholly owned by Telefónica Germany. It was created by E-Plus in 2005 and moved into the Telefónica portfolio after the E-Plus / Telefónica merger completed in 2014.
Is AY YILDIZ the cheapest way to call Turkey from Germany?
For Turkish landlines bundled with German allnet minutes, AY YILDIZ is one of the cheapest options thanks to sub-EUR 10/month prepaid tiers. For Turkish mobile networks, per-minute add-ons still apply - Lebara and Ortel can be cheaper depending on the destination operator.
Does AY YILDIZ offer eSIM?
Yes. eSIM is supported on both prepaid and the Ay Allnet Plus contract, activated through the AY YILDIZ app and account portal.
What ID do you need to register?
Germany enforces prepaid SIM registration under BNetzA rules. You need a passport or EU national ID plus an Anmeldung address, and you complete verification via video-ident or post-ident before the SIM activates - the same process as any other German operator.