Updated September 30, 2026 · TariffCue Editorial Team
Blau.de vs O2 CZ Datamanie
Blau.de vs O2 CZ Datamanie: the differences
| Compare |  Blau.de |  O2 CZ Datamanie |
|---|---|---|
| Seller type | Mvno | Network |
| Price from | €6.99 | CZK 199 |
| Reference plan prices | Blau Allnet M: 8.99 EUR/month, 40 GB, 24 months Blau Allnet S Flex: 6.99 EUR/month, 15 GB, rolling (1 month notice) No unlimited plan listed; highest listed is Blau Allnet XL Promo: 14.99 EUR/month, 80 GB, 24 months | Datamanie 1200GB: 249 CZK per month, 1200 GB per year, annual prepay; Datamanie NEO: 499 CZK per month, unlimited, 30-day; Datamanie 2GB: 199 CZK per month, 2 GB, 30-day |
| Markets | DE | CZ |
| Host network | Telefonica (O2 network) | Not confirmed |
| Unlimited plan price | Not confirmed | CZK 499 |
| Roaming countries | from 100 | Not confirmed |
| Multi-line discount | Yes | Not confirmed |
Same on both: SIM-only (Yes), 5G (Yes), eSIM (Yes), EU roaming (Fair use), Credit check required (No).
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Key differences
- Blau.de scores higher overall: 9.0 vs 8.9.
- Support channels: only Blau.de offers Help centre, Email.
- Billing: only Blau.de offers Contract, Rolling.
- Contract length: only Blau.de offers 24.
- Markets: only Blau.de offers DE.
- Markets: only O2 CZ Datamanie offers CZ.
Our verdict on each
Blau.de
Blau suits anyone who wants a cheap German mobile line on a handset they already own, with sim only plans starting at €6.99 a month and no credit check. The trade-off is term length: only Blau Allnet S Flex rolls, and no plan in the range is unlimited.
O2 CZ Datamanie
O2 CZ Datamanie suits Czech readers who want a prepaid sim only line with eSIM, 5G and no credit check, and who will stay on their home network rather than travel. Entry sits at CZK 199 and the unlimited plan at CZK 499, a solid pair for a single market.
Score breakdown
| Area | Blau.de | O2 CZ Datamanie |
|---|---|---|
| Cost | 9.0Cost 9 leans on the rolling Blau Allnet S Flex at €6.99, with sim only across the range and no handset bundle. | 9.0Prepaid billing, plans from CZK 199, unlimited data at CZK 499, ranked 146 of 258. |
| Offer | 9.0Higher9 reflects esim and 5G, roaming across from 100 countries, a multi line discount, and no credit check required. | 8.8Sim only, eSIM and 5G, no credit check, roaming on fair use terms in CZ. |
| Trust | 8.98.9 rests on Telefónica Germany GmbH & Co. OHG trading since 2005, with support on phone, chat and help centre. | Not confirmed |
Availability and regulation
| Country | Blau.de | O2 CZ Datamanie |
|---|---|---|
| Headquarters | Germany | Czechia |
Additional countries for Blau.de: 1. Additional countries for O2 CZ Datamanie: 1.
Where they rank in our lists
| Ranking | Blau.de | O2 CZ Datamanie |
|---|---|---|
| SIM-only deals | 165 of 416 | 217 of 416 |
| Prepaid phone plans | 145 of 367 | 186 of 367 |
| Phone plans with eSIM | 174 of 389 | 211 of 389 |
| Phone plans without a credit check | 9 of 26 | 17 of 26 |
Every fact side by side
| Fact | Blau.de | O2 CZ Datamanie |
|---|---|---|
| Billing | Contract, Rolling, PrepaidCovers more | Prepaid |
| Contract length | 1, 24Covers more | 1 |
| Legal entity | Telefónica Germany GmbH & Co. OHG | O2 Czech Republic a.s. |
| Headquarters | Germany | Czechia |
| Founded | 2005 | Not confirmed |
| Support channels | Phone, Chat, Help centre, EmailCovers more | Chat, Phone |
Where each stands against the rest
| Fact | Blau.de | O2 CZ Datamanie | Median |
|---|---|---|---|
| Roaming countries | from 100at the median | Not confirmed | 100 |
Median across 176 listed providers.
Pros and cons
Blau.de
Pros
- Entry is low for a contract mobile plan: Blau Allnet S Flex starts at €6.99 a month, under the €9.30 entry price across the site.
- No credit check is required, so a signup does not hinge on a credit file.
- An esim is available, so a compatible phone can be provisioned digitally on the host network.
Cons
- Use inside the EU is on fair use terms rather than a stated allowance, so a month of heavy use in Europe can cost extra.
- Blau serves DE, so the deal does not stretch to a second market.
- Terms run 1 and 24 months, and the roomier plans, Blau Allnet M and Blau Allnet XL Promo, sit at the long end, while only Blau Allnet S Flex rolls.
O2 CZ Datamanie
Pros
- Entry pricing starts at CZK 199 on prepaid billing.
- An eSIM, 5G and sim only are all available, so a handset you already own keeps working.
- No credit check is needed to start the line.
Cons
- Roaming in Europe runs on fair use terms rather than being included, so frequent travel abroad costs extra.
- Plan terms are 1 month, so plans renew on a short cycle with no longer term to hold a lower price.
- Service is confined to CZ, so the line does not travel beyond the Czech Republic.
Who each suits
Blau.de
Who it suits
- Households that already own a handset and want an extra line, since every Blau plan is sim only and a multi line discount applies.
- Anyone who wants to sign up without a credit check, since none is required, and who can pick contract, rolling or prepaid billing from contract, rolling and prepaid.
- Light-to-moderate data users who travel now and then: roaming reaches from 100 countries, with EU use on fair use terms.
Who should look elsewhere
- Shoppers who want to buy straight from the host network: Blau is a seller of type mvno, while GETESA, Lonestar Cell MTN and yesss! each sell as a network.
- Anyone who needs unlimited data, since no Blau plan is unlimited; yesss! sets its own tariff as a network seller.
- Users outside DE, where the range is sold in a single market, so a network from their own home market such as GETESA or Lonestar Cell MTN is the fairer starting point.
O2 CZ Datamanie
Who it suits
- Readers in the Czech Republic who already have a phone and only need a line for calls and data.
- People who want to activate a prepaid line without a credit check or a long commitment.
- Travellers in Europe whose roaming is occasional rather than everyday.
Who should look elsewhere
- getesa, if you want a contract tariff alongside prepaid, since its billing options are prepaid and contract.
- yesss!, if you want rolling billing, since its billing options are contract, rolling and prepaid while this line is prepaid only.
- lonestar-cell-mtn, if you need a plan that serves a wider set of countries, since this line runs on CZ alone.
Country by country
| Country | Blau.de | O2 CZ Datamanie |
|---|---|---|
| Czechia | No | Yes |
| Germany | Yes | No |
Questions about each
Blau.de
How much is the cheapest Blau plan?+
Blau Allnet S Flex is the entry plan at €6.99 a month, billed rolling with a month's notice rather than a fixed term. The next tier, Blau Allnet M, carries a longer commitment, and the largest listed, Blau Allnet XL Promo, sits at the long end of the term range. Among the brands ranked on entry price, Blau holds position 132 of 258.
Does Blau run a credit check?+
No credit check is required, which is why these tariffs sit alongside the no credit check plans in this group. Billing spans contract, rolling and prepaid, so the same walk-through applies whether a customer picks a fixed term or a prepaid option, and an esim is available to get the line running without a paper card.
O2 CZ Datamanie
How much does O2 CZ Datamanie cost to start?+
Plans start at CZK 199 on prepaid billing, with plan terms of 1 month. Because billing is prepaid, you pay for the period you want and nothing beyond it, so no minimum spend has to be reached before the line is live.
What does the unlimited data plan cost?+
The Datamanie NEO plan gives unlimited data for CZK 499 and renews on a short cycle. If your data use swings from month to month, that flat cost removes the guessing, while the capped plan at CZK 199 suits steadier, lighter use.