Updated September 30, 2026 · TariffCue Editorial Team
Blau.de vs Chattr SIM Only
Blau.de vs Chattr SIM Only: the differences
| Compare |  Blau.de |  Chattr SIM Only |
|---|---|---|
| Host network | Telefonica (O2 network) | O2 |
| Price from | €6.99 | £5 |
| EU roaming | Fair use | Included |
| Roaming countries | from 100 | 43 |
| Markets | DE | GB |
| 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 | Not confirmed |
| eSIM | Yes | Not confirmed |
| Mid-contract price rises | Not confirmed | No price hikes |
| Multi-line discount | Yes | Not confirmed |
| Network coverage | Not confirmed | 99% |
Same on both: Seller type (Mvno), SIM-only (Yes), 5G (Yes), 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 Phone, Chat, Help centre.
- Billing: only Blau.de offers Contract, Prepaid.
- Contract length: only Blau.de offers 24.
- Markets: only Blau.de offers DE.
- Markets: only Chattr SIM Only offers GB.
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.
Chattr SIM Only
Chattr SIM Only suits people in GB who want a rolling SIM that can leave any month and will not raise the bill. Roaming is already included.
Score breakdown
| Area | Blau.de | Chattr SIM Only |
|---|---|---|
| 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. | 9.1HigherEntry price of £5 on rolling billing, and No price hikes keeps renewals at the same figure. |
| Offer | 9.0Higher9 reflects esim and 5G, roaming across from 100 countries, a multi line discount, and no credit check required. | 8.7Roaming in 43 countries, included, 5G and 99% coverage on O2. |
| Trust | 8.98.9 rests on Telefónica Germany GmbH & Co. OHG trading since 2005, with support on phone, chat and help centre. | Not confirmed |
Positions in our rankings
| Ranking | Blau.de | Chattr SIM Only |
|---|---|---|
| SIM-only deals | 165 of 416 | 200 of 416 |
| Cheap cell phone plans (MVNOs) | 77 of 137 | 94 of 137 |
| Phone plans without a credit check | 9 of 26 | 15 of 26 |
Every fact side by side
| Fact | Blau.de | Chattr SIM Only |
|---|---|---|
| Billing | Contract, Rolling, PrepaidCovers more | Rolling |
| Contract length | 1, 24Covers more | 1 |
| Legal entity | Telefónica Germany GmbH & Co. OHG | Kashcow Ltd |
| Headquarters | Germany | United Kingdom |
| Founded | 2005 | Not confirmed |
| Support channels | Phone, Chat, Help centre, EmailCovers more |
Where each stands against the rest
| Fact | Blau.de | Chattr SIM Only | Median |
|---|---|---|---|
| Roaming countries | from 100at the median | 43below the median | 100 |
| Network coverage | Not confirmed | 99%at the median | 99% |
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.
Chattr SIM Only
Pros
- £5 is the entry price on the SIM only plan, and No price hikes means the renewal bill does not climb
- included roaming across 43 countries comes as standard rather than as an add-on
- Rolling billing on a term of 1-month means the line can end without an exit charge
Cons
- Support runs on email only, so a question with no quick email answer waits for a reply
- Service covers GB alone, so the SIM does not work for a trip outside the UK unless roaming applies
- Chattr SIM Only is an mvno on the O2 network, so coverage follows the host rather than a network of its own
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.
Chattr SIM Only
Who it suits
- Anyone in GB already holding a handset and happy to bring their own SIM
- Travellers who want included across 43 countries without a roaming add-on
- People who need a credit check free line and prefer rolling billing over a locked contract
Who should look elsewhere
- GETESA, Lonestar Cell MTN and yesss! sell as networks rather than an mvno, so buyers wanting the host's own support and shop presence should look there first
- Phone buyers wanting a handset bundled with the line, as this offer is SIM only
- People wanting phone or chat support, since help runs on email alone
Country by country
| Country | Blau.de | Chattr SIM Only |
|---|---|---|
| Germany | Yes | No |
| United Kingdom | No | Yes |
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.
Chattr SIM Only
What does the cheapest Chattr SIM Only plan cost?+
The SIM only line starts at £5. That is the entry price for the plan rather than a promotional first bill, and No price hikes applies, so the same figure carries over to renewal. Larger data allowances are available on the same rolling billing.
Does the price go up when I renew?+
No. The stated position is No price hikes, so the monthly figure a customer starts on is the figure carried forward. Renewal pricing is therefore predictable, which is unusual among rolling SIM only deals where providers often adjust charges over time.