1&1 (1und1) review
Updated September 28, 2026 · NomadCue Editorial Team · Facts checked September 26, 2026
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Our verdict
1und1 is a German mobile carrier, not a travel eSIM, so it suits readers who live in Germany and want a home plan that still works abroad. Its flat rate adds unlimited data, subject to a fair use policy, plus 5G and instant activation, and roaming spans 33 countries from €9.99.
Key facts
- Best for
- Short trips out of Germany on an existing home mobile contract.
- Price from
- €9.99↗
- Countries covered
- 33↗
- Unlimited data
- Yes↗
- 5G
- Yes↗
- Fair use policy
- Roaming fair use: use must show ordinary residence in Germany, otherwise roaming surcharges apply; after the plan's high-speed volume is used up data continues unlimited at 64 kbit/s; Unlimited XL includes 61.2 GB/month in the EU, then 1.31 EUR/GB↗
- Networks
- 1&1 Mobilfunknetz (Open RAN), Telefonica Germany (national roaming)↗
- Top-ups
- Yes↗
- Seller type
- Carrier↗
- 10 GB in Europe
- €9.99↗
- Legal entity
- 1&1 Telecommunication SE↗
- Headquarters
- Germany↗
- Founded
- 1988↗
- Support channels
- Email, Chat, Phone, Help-centre↗
- Region
- Regional
- Features
- Unlimited data, 5G, Instant activation, Carrier plan
- Audience
- Short trips
- Official website
- 1und1.de
Facts checked September 26, 2026, 4 sources
Pros and cons
Pros
- Unlimited data, 5G and instant activation sit in one flat rate from €9.99, and the fair use policy says what happens after the high-speed volume is used up.
- Support runs on email, chat and phone, so help comes from the carrier itself.
- Top-ups are available, and regional reach suits a short trip away from Germany.
Cons
- Roaming spans 33 countries, well short of Zwitchy at 200.
- The fair use policy requires an ordinary residence in Germany, so the roaming offer does not suit visitors without a German home.
- The €9.99 price sits above the site median of €5, and it is a carrier home plan rather than a travel eSIM.
Who it suits
- German residents taking short trips who want one plan at home and abroad.
- Travellers who want unlimited data with 5G and instant activation under a single contract.
- Readers who already buy from a German carrier and would rather add roaming than buy a travel pass.
Who should look elsewhere
- Visitors with no German residence, because the fair use policy ties roaming to an ordinary residence in Germany.
- Readers who need broad coverage, who will find more countries at Zwitchy with 200.
- Price-first shoppers, since eSIMGo.is starts at $0.99.
Coverage and networks
Roaming spans 33 countries, and the plan is regional in scope rather than global. At home, service uses 1&1 Mobilfunknetz (Open RAN) and Telefonica Germany (national roaming), so 5G is available and subscribers on the right handset stay on the carrier's own radio. Abroad, the fair use policy requires an ordinary residence in Germany, and a per-GB charge follows the monthly EU allowance on Unlimited XL.
Who runs it
1und1 is run by 1&1 Telecommunication SE, based in Germany and founded in 1988. It is a carrier, so the plan comes straight from the operator rather than a reseller or marketplace. Support runs on email, chat and phone, so a reader dealing with roaming questions reaches the company that operates the network.
How 1&1 (1und1) compares
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Where 1&1 (1und1) is available
- Available
- Germany
Countries from the brand (Source, checked September 26, 2026)
Frequently asked questions
How much does a 1und1 roaming plan cost?+
Plans start at €9.99, and that price buys the home contract rather than a travel pass. The site median price across the brands listed is €5, so a reader comparing on price alone will find eSIMGo.is cheaper at $0.99.
How many countries does 1und1 roaming cover?+
Roaming spans 33 countries, which is far fewer than Zwitchy at 200. The plan is regional in scope, so a trip to a handful of nearby countries is the realistic use rather than a world tour.
Is the data allowance really unlimited?+
Unlimited data is included, but a fair use policy applies: use has to show an ordinary residence in Germany, and once the plan's high-speed volume is used up data continues at a much lower speed. The EU allowance on Unlimited XL runs monthly, and a per-GB charge follows it.
How fast is the connection abroad?+
5G is part of the plan, and at home traffic runs on 1&1 Mobilfunknetz (Open RAN) and Telefonica Germany (national roaming). Speed abroad depends on the visited network, while the fair use policy requires ordinary residence in Germany and applies roaming surcharges when it is not met.
What is the price per GB while roaming?+
Roaming is handled by the fair use policy rather than a simple per-GB price, with surcharges once the plan's high-speed volume is used up. Unlimited XL sets a monthly EU allowance, and readers comparing per-GB rates can check the site median of €1.50.
How is the plan set up?+
It is a carrier plan with instant activation listed among its features, so there is no travel eSIM to install. The trade-off is setup: a reader has to hold a 1und1 contract and a German address, not just buy a pass at checkout.
Which kind of trip does this plan suit?+
The fit is a short trip away from Germany: short trip is the stated audience, and regional reach fits a handful of nearby countries. Anyone crossing continents needs a provider built for a single market instead, such as SimToIsrael from $25.
Where can I get help?+
Support runs on email, chat and phone, so email, chat, phone and a help centre are all open to a subscriber. Because 1und1 is the carrier behind the plan, roaming questions go to the operator rather than a reseller.
Sources
- mobile.1und1.de/all-net-flat-vergleich checked September 26, 2026
Backs: Features, 5G, 10 GB in Europe, Price from, Region, Unlimited data
“300 MBit/s 5G Highspeed - 5G coverage nationwide in Germany approx. 95%, almost 100% by end of 2026”
- unternehmen.1und1.de/unternehmen/geschichte checked September 26, 2026
Backs: Founded, Networks, Seller type
“1988 - Ralph Dommermuth lays the foundation for today's 1&1 AG by founding 1&1 EDV-Marketing GmbH in Montabaur”
- 1und1.de/impressum checked September 26, 2026
Backs: Headquarters, Legal entity, Support channels
“1&1 Telecommunication SE, Elgendorfer Str. 57, 56410 Montabaur”
- 1und1.de/roaming checked September 26, 2026
Backs: Audience, Countries covered, Fair use policy, Top-ups
“Whether holiday or business trip - discover Europe and call, surf and text with no extra cost”
Compiled from 4 source pages, checked September 26, 2026. We did not open an account.
Not confirmed yet: Price per GB from, Hotspot sharing.