Which congstar plan is best in 2026?

Which congstar plan is best in 2026?

Best overall postpaid · Best annual prepaid · Cheap 4-week pick · Flexible build-your-own

congstar publishes four product families. Allnet Flat M at €15/month for 23 GB on a 1-month rolling SIM-only contract is the best all-round pick. The Jahrespaket prepaid 240 GB at €100/year is the cheapest way onto D-Netz for a full year. Prepaid Allnet M sits at €10 every 4 weeks for 25 GB — useful for users who want SIM-only without an account. The custom Prepaid wie ich will starts at €2/4w.

How is congstar's network (Telekom D-Netz)?

Same cell sites as Telekom · 25 Mbit/s prepaid cap · 50 Mbit/s postpaid · 5G enabled

congstar runs directly on Deutsche Telekom’s D-Netz as a wholly-owned in-house MVNO. Coverage equals the parent network — the same towers, the same indoor reception, the same connect magazine #1-ranked footprint. The difference is speed: prepaid is capped at 25 Mbit/s, postpaid Allnet Flat at 50 Mbit/s. 5G is enabled across all tiers, the cap just limits peak throughput.

D-Netz is the network Telekom has spent two decades calling its strategic asset. connect magazine’s 2025 mobile network test ranked it first in Germany for the 13th year in a row, ahead of Vodafone (D2) and O2. For congstar customers, that means federal coverage parity with the most-expensive postpaid SIM in the country — rural areas, ICE rail corridors, motorway tunnels and indoor reception in city basements all match.

Source: congstar.de tariff pages, Telekom Magenta tariff pages, connect Netztest 2025, verified May 2026

Practical implication: the 25 Mbit/s cap is enough for HD video streaming (Netflix needs ~5 Mbit/s for 1080p), navigation, tethering for laptop work, and video calls. You only notice the cap if you download large files or use the SIM as a primary home internet line. The 50 Mbit/s postpaid cap removes even that ceiling for most use cases.

How much does congstar cost compared to Telekom direct?

Allnet Flat saves €15/month · Prepaid saves cents · Speed cap is the trade-off

On postpaid Allnet Flat, congstar is roughly half the price of equivalent Telekom MagentaMobil tariffs for the same network. On prepaid, the gap is small — cents per 4-week tier — but congstar gives more data per Euro. The cost-equivalent line is clear: congstar trades raw peak speed (capped at 25/50 Mbit/s) for a 30–50% discount on monthly fee.

Source: congstar.de + telekom.de tariff pages, verified May 2026

The Allnet Flat comparison is the most striking. Telekom MagentaMobil M costs €34.95/month for 20 GB on a 24-month contract; congstar Allnet Flat M is €15/month for 23 GB on a 1-month rolling SIM-only. You give up peak speed above 50 Mbit/s and Telekom-branded MultiSIM perks, but save €240/year on the same network. The MagentaMobil tier only makes sense if you genuinely need 200+ Mbit/s peak or want StreamOn / Hotspot Flat extras.

What's the difference between congstar Allnet Flat and prepaid?

Contract vs top-up · Speed cap differs · Billing model

Allnet Flat is a postpaid SIM-only contract billed monthly via SEPA direct debit on a 1-month rolling term — you can cancel any month and the speed cap is 50 Mbit/s. Prepaid is top-up-based, billed in 4-week cycles from your credit balance, capped at 25 Mbit/s, with no account, no SCHUFA check, and no cancellation needed — you simply stop topping up.

• Speed cap. Allnet Flat is throttled to 50 Mbit/s LTE/5G; prepaid to 25 Mbit/s. Both still receive a 5G signal where available. Telekom-branded SIMs uncapped at 300 Mbit/s peak.
• Billing. Allnet Flat is a direct-debit monthly charge needing a German bank account (IBAN). Prepaid uses card top-ups, code vouchers from Rewe, Norma, Rossmann, MediaMarkt, or in-app top-up.
• Identity check. Both require KYC under German prepaid SIM rules: VideoIdent for online sign-up, PostIdent or in-shop ID check for paper sign-up. Allnet Flat additionally runs a SCHUFA credit check; prepaid does not.
• Cancellation. Allnet Flat cancels at any month end with no termination fee. Prepaid has no cancellation: stop topping up and the SIM enters dormancy after about 15 months.
• Inclusions. Both include EU roaming under RLAH rules, free 0800 calls, German Allnet calling, and 5G access. Allnet Flat additionally offers MultiSIM (extra SIM for smartwatch / tablet) and easier data-pack top-ups when you exceed the cap.

What are the pros and cons of congstar?

Strengths · Limits · When it’s the right pick

congstar’s strength is the D-Netz at MVNO prices proposition: same towers as Telekom, half the cost on the Allnet Flat. The trade-offs are capped peak speed (25/50 Mbit/s), thinner customer-service hours than Telekom, and no Multi-Telekom perks (MagentaEINS, StreamOn). It’s the right choice if you value coverage and price over peak speed and bundle extras.

How do you sign up for congstar?

Online or shop · ID verification required · eSIM available

Sign-up takes 5–15 minutes online via congstar.de or in any Telekom shop, Rewe, Norma, Rossmann or MediaMarkt. You need a valid passport or German ID, an Anmeldung-backed German address, and (for Allnet Flat) a German IBAN plus SCHUFA. Prepaid doesn’t need IBAN or SCHUFA but does require ID verification. eSIM activates in minutes; physical SIMs arrive in 1–3 working days.

1. Pick the product line. Allnet Flat for users who want a postpaid contract and 50 Mbit/s; Jahrespaket for a year of prepaid in one payment; Prepaid Allnet for month-to-month flexibility; Prepaid wie ich will for custom bucket sizing.
2. Choose eSIM or physical SIM. congstar supports eSIM on Allnet Flat and most prepaid tiers. eSIM activates after ID verification; physical SIMs are shipped free to your German address. (eSIM in 5–15 min after ID; physical SIM 1–3 days)
3. Complete ID verification (VideoIdent or PostIdent). Required by German telecoms law for all SIMs. VideoIdent is a 5-minute video call with a passport. PostIdent is at any Deutsche Post branch with the same passport. In-shop sign-up handles it at the counter.
4. Request a Rufnummernmitnahme PAC (optional). If you want to keep your existing German number, request a Portierungs-PIN from your current operator. congstar credits €25 to your account when you bring a number across. (porting completes within 1 working day)
5. Activate and test. Insert the SIM or scan the eSIM QR. The number is live as soon as the German Federal Network Agency’s number-portability database updates. Place a test call and check the data speed in the congstar app.

Should you pick congstar or fraenk/ja!mobil?

Three Telekom-owned MVNOs · Different niches

All three sit on Telekom D-Netz, but they cover different niches. congstar is the broadest range — postpaid Allnet Flat, prepaid, and annual. fraenk is app-only, €10/month for 10 GB with no contract, no paper, no shop. ja!mobil (sold at Rewe) is prepaid-only and ultra-cheap for low data users. Pick congstar for breadth, fraenk for app-native simplicity, ja!mobil for sub-€8 prepaid.

Source: congstar.de, fraenk.de, ja-mobil.de, verified May 2026

The decision rule is simple: if you want a postpaid contract on Telekom but cannot stomach Telekom prices, congstar Allnet Flat M wins. If you want zero paperwork and never want to talk to support, fraenk wins on its app-only model. If you want the cheapest possible D-Netz SIM and only need 4–10 GB, ja!mobil at Rewe wins. All three deliver the same coverage underneath.

How did we rank congstar?

Five-dimension scoring · operator-verified data · affiliate-independent

congstar was scored on five equally-weighted dimensions: price per GB, contract flexibility, network coverage, speed cap, and retail availability. Pricing was pulled from congstar.de tariff pages in May 2026, cross-checked against telekom.de for the parent-brand comparison and against BNetzA-published Federal Network Agency data for coverage claims.

Verdict: congstar earns its place as the best all-round Telekom MVNO for buyers who want D-Netz coverage without a 24-month lock-in. The Allnet Flat M tier wins overall; the Jahrespaket is the cleanest annual option; the prepaid M is the cheapest 4-week pick. Sources: congstar.de tariff pages, telekom.de MagentaMobil pages, connect Netztest 2025, BNetzA mobile coverage map, all verified May 2026.